2. Core Spelling Rules

Rule 1: "I before E, except after C" — and its real exceptions

The classic mnemonic states that i comes before e, except when the pair follows c, in which case e comes before i. This holds reasonably well when the pair makes a long "ee" sound.

I before E (long "ee" sound, no preceding C): believe, chief, field, niece, piece, relief, siege, yield, achieve, grief

E before I (after C, long "ee" sound): ceiling, conceive, deceive, perceive, receipt, receive

Genuine exceptions (must be memorized separately): The rule only ever applied to the "ee" sound. When the pair makes any other sound — especially a long "ay" sound — the order flips regardless of what precedes it: neighbour, weigh, eight, vein, reign, freight, weight. There is a whole separate set of words where e comes before i with no "c" in sight and no "ee" sound: seize, weird, either, neither, foreign, forfeit, height, leisure, protein, caffeine, science, society. Because exams love testing exactly this second group, memorize them as a standalone list rather than trying to stretch the rhyme to cover them.

Rule 2: Doubling the final consonant before a vowel suffix (1-1-1 rule)

When a word ends in a single vowel + single consonant, and it is stressed on the last syllable (or is a one-syllable word), you double the final consonant before adding a suffix that begins with a vowel (-ing, -ed, -er, -est, -able).

Doubling applies: stop → stopped, run → running, big → bigger, hot → hottest, admit → admitted, occur → occurred, refer → referred, begin → beginning

Doubling does NOT apply when the last syllable is unstressed: benefit → benefited (not benefitted, though this is a genuine British/American variant point), offer → offered, visit → visited, happen → happened, focus → focused

Doubling does NOT apply when the word ends in two consonants, or two vowels + one consonant: jump → jumping, look → looked, need → needed (two vowels before the consonant)

Exceptions to watch: "travel" is British "travelled" but American "traveled" (covered further in Section 4); "kidnap" doubles despite the unstressed-looking pattern — kidnapped, kidnapping — because British convention treats the final syllable as stressed enough.

Rule 3: When NOT to double — words ending in a single consonant preceded by TWO vowels

A very common trap is doubling a consonant that shouldn't be doubled because the word "looks similar" to a 1-1-1 word. If two vowels precede the final consonant, do not double it.

Examples: repeat → repeated, remain → remained, appear → appeared, contain → contained, wait → waited, feel → feeling, loot → looted, cheat → cheating

Rule 4: Dropping the silent final "E" before a vowel suffix

When a word ends in a silent e, drop the e before adding a suffix that begins with a vowel.

Examples: make → making, hope → hoping, argue → arguing, believe → believing, write → writing, use → usable, guide → guidance, continue → continuous

Exceptions where the E is kept even before a vowel suffix (to preserve pronunciation or distinguish meaning): words ending in -ce or -ge keep the e before -able or -ous to keep the "soft" c/g sound: noticeable, manageable, courageous, outrageous, changeable. Also: dyeing (to keep it distinct from dying), and singeing (distinct from singing).

Rule 5: Keeping the silent "E" before a consonant suffix

When the suffix begins with a consonant (-ment, -ly, -ness, -ful, -less), the silent e is normally kept.

Examples: hope → hopeful, care → careful, safe → safely, sincere → sincerely, achieve → achievement, arrange → arrangement, love → lovely

Exceptions where the E is dropped even before a consonant suffix: true → truly, argue → argument, whole → wholly, due → duly, nine → ninth, awe → awful, judge → judgment (British English also accepts judgement, but judgment is the standard legal/formal spelling).

Rule 6: Changing "Y" to "I" before a suffix

When a word ends in a consonant + y, change the y to i before adding a suffix — except when the suffix itself begins with i (to avoid a double "i").

Examples: happy → happiness, happier, happiest; carry → carried, carrier; beauty → beautiful; easy → easily; try → tried; supply → supplied

Y is kept before -ING (to avoid "ii"): carry → carrying, try → trying, study → studying, apply → applying, deny → denying

Rule 7: When NOT to change "Y" to "I" — vowel before the Y

When a word ends in a vowel + y, the y is kept unchanged before any suffix.

Examples: play → played, playing, player; enjoy → enjoyed, enjoying, enjoyment; buy → buying; stay → stayed; employ → employed, employer

Common exceptions (irregular): day → daily, pay → paid, lay → laid, say → said. These are irregular precisely because they break the "vowel before y stays unchanged" rule, which is exactly why they are exam favourites.

Rule 8: Plurals of nouns ending in "-O"

Some nouns ending in o add just -s, others add -es, and there is no fully reliable rule — only strong tendencies (words related to music, of Italian origin, tend to take -s; everyday English words often take -es).

Add -S: photo → photos, piano → pianos, radio → radios, studio → studios, video → videos, kilo → kilos, solo → solos, memo → memos

Add -ES: potato → potatoes, tomato → tomatoes, hero → heroes, echo → echoes, volcano → volcanoes (also volcanos, but -oes is preferred in formal writing), torpedo → torpedoes, mosquito → mosquitoes (also mosquitos)

Genuine dual-acceptable words: buffalo → buffalos/buffaloes; zero → zeros/zeroes; motto → mottos/mottoes. In an exam, if a "which is correctly spelled" question offers only one of the two accepted forms, go with the more traditionally listed one — -oes for the words above, -os for the music/Italian-origin group.

Rule 9: Plurals of nouns ending in "-F" or "-FE"

Many nouns ending in f or fe change to -ves in the plural; others simply add -s.

Change to -VES: leaf → leaves, knife → knives, wife → wives, life → lives, half → halves, shelf → shelves, wolf → wolves, thief → thieves, loaf → loaves, calf → calves

Simply add -S: roof → roofs, chief → chiefs, cliff → cliffs, belief → beliefs, proof → proofs, gulf → gulfs, safe → safes (as in strongboxes)

Dual-acceptable: scarf → scarfs/scarves; hoof → hoofs/hooves; wharf → wharfs/wharves. When an exam wants a single "correct" answer, the -ves form is usually the one expected.

Rule 10: Plurals of nouns ending in "-US" (Latin origin)

Many Latin-derived nouns ending in -us form their plural with -i, though a good number now also accept a regular -uses plural in modern usage.

Classical -I plural: cactus → cacti, focus → foci, fungus → fungi, radius → radii, stimulus → stimuli, syllabus → syllabi (also syllabuses), nucleus → nuclei, alumnus → alumni

Regular -US/-USES (no classical plural, or the regular form is now standard): virus → viruses, bonus → bonuses, campus → campuses, census → censuses, chorus → choruses

Rule 11: Plurals of nouns ending in "-IS" and "-ON" (Greek origin)

Greek-derived nouns ending in -is typically change to -es in the plural; those ending in -on often change to -a.

-IS → -ES: analysis → analyses, crisis → crises, thesis → theses, basis → bases, oasis → oases, axis → axes, diagnosis → diagnoses, hypothesis → hypotheses

-ON → -A: criterion → criteria, phenomenon → phenomena, automaton → automata

Note the common exam trap: data is technically the plural of datum, and media is technically the plural of medium — both are Latin, not Greek, but they follow the same "irregular foreign plural" logic and are frequently tested alongside the Greek group above.

Rule 12: Plurals of nouns ending in "-A" (Latin/Greek origin)

A smaller group of nouns ending in -a form irregular plurals in -ae, chiefly in formal/scientific usage, though a regular -s form is often equally acceptable today.

Examples: larva → larvae (also larvas), alga → algae, formula → formulae (also formulas, which is common in everyday and mathematical use), antenna → antennae (also antennas, especially for the mechanical device sense), vertebra → vertebrae

Rule 13: Irregular plurals that don't fit any pattern

A small, high-frequency set of nouns simply must be memorized because they follow no productive rule at all.

Examples: man → men, woman → women, child → children, foot → feet, tooth → teeth, mouse → mice, goose → geese, person → people, ox → oxen

Unchanged in the plural: sheep, deer, fish (usually unchanged, though "fishes" exists for multiple species), series, species, aircraft

Rule 14: -ABLE vs -IBLE

Both suffixes mean roughly "capable of being." As a working rule: -able attaches to a word that could stand alone as a complete English word (often ending in a consonant, or with the silent e dropped), while -ible attaches to a root that is not a free-standing English word on its own (usually a Latin root).

-ABLE (root is a real standalone word): acceptable, comfortable, dependable, reasonable, remarkable, understandable, breakable, avoidable

-IBLE (root is not a standalone English word): possible, visible, credible, terrible, horrible, edible, legible, tangible

Notorious exceptions that must be memorized individually because the rule doesn't cleanly predict them: responsible (not "responsable"), flexible, digestible, accessible, permissible, collectible/collectable (both accepted, though -ible is more traditional).

Rule 15: -ANCE vs -ENCE

Like -able/-ible, these are near-identical in sound and depend on Latin verb ancestry, which is not obvious from the English word alone. There is no fully reliable shortcut; the safest approach is to learn the two lists as sight-words.

-ANCE words: appearance, attendance, guidance, assistance, importance, resistance, maintenance, performance, ignorance, endurance

-ENCE words: existence, difference, evidence, confidence, patience, audience, experience, reference, occurrence, intelligence

A partial helper: words whose related adjective ends in -ant usually take -ance (important → importance, resistant → resistance), and words whose adjective ends in -ent usually take -ence (confident → confidence, different → difference). This helper is reliable enough to use as a first guess, but always double-check against the word lists above.

Rule 16: -ARY vs -ERY vs -ORY

These three endings are also governed by Latin word history rather than sound, but -ery is by far the smallest and most closed group, which makes it worth memorizing outright.

-ARY (the largest group): dictionary, necessary, secretary, temporary, ordinary, boundary, stationary, anniversary, elementary

-ERY (a small, closed group — largely fixed): bakery, stationery, machinery, cemetery, grocery, robbery, discovery, flattery

-ORY: category, directory, laboratory, territory, factory, memory, victory, history

The single most tested pair in this whole rule: stationary (meaning "not moving") versus stationery (meaning "paper and writing materials"). Memory trick: stationery has an "e" like "envelope" and "evidence of the shop"; stationary has an "a" like "at rest."

Rule 17: -ISE vs -IZE (and -YSE vs -YZE)

This is fundamentally a British vs American spelling issue, covered in depth in Section 4, but it is worth flagging as a rule here because it is tested so often in isolation. British English traditionally allows both -ise and -ize for most verbs (Oxford spelling actually prefers -ize for many words), but Indian competitive exams almost always expect the -ise form, matching everyday British/Indian usage and most exam answer keys.

Expected exam spelling (British, -ISE): organise, realise, recognise, apologise, criticise, emphasise, memorise, specialise

A small set of words are ALWAYS -YSE in British English, never -YZE: analyse, paralyse, catalyse — these should never be written with a "z" in a British-convention answer, even though American English does write analyze, paralyze, catalyze.

A small set of words are ALWAYS -IZE in both British and American English (never -ISE), because the "s" version is not a recognized spelling at all: size, prize, capsize. Seize is actually unrelated in origin but is frequently misgrouped here — treat it as a standalone irregular word.

Rule 18: Silent "K" before "N" (kn-)

A word-initial kn- cluster is always pronounced as a plain "n" in modern English; the k is silent.

Examples: knife, knee, know, knight, knock, knot, knowledge, knuckle, kneel, knit

Rule 19: Silent "W" before "R" (wr-)

A word-initial wr- cluster drops the "w" sound entirely; only the "r" is pronounced.

Examples: write, wrong, wrap, wrist, wreck, wrestle, wrinkle, wrath, wreath, wretch

Rule 20: Silent "GH"

The gh combination is silent in a large number of common words, almost always following a vowel, and is one of the most frequently tested silent-letter patterns because so many high-frequency words contain it.

Examples where GH is fully silent: night, light, sight, though, through, thought, bought, caught, daughter, straight, height, weight, neighbour

Note that GH is NOT always silent — it is pronounced as an "f" sound in a smaller set of words, which is itself a useful contrast to test: enough, tough, rough, laugh, cough, draught.

Rule 21: Silent "B" after "M"

When b follows m at the end of a word or root, it is silent.

Examples: climb, comb, thumb, lamb, limb, crumb, numb, bomb, tomb, dumb

Note the exception when a suffix is added: the b stays silent even in the extended forms — climbing, combed, numbness — but it resurfaces as a pronounced sound in a few related words: bombard, crumble (silent again here actually — crumble keeps it silent), and notably amble/tumble where the b is pronounced because it isn't in the "root + silent-b" pattern at all — it's part of the original spelling. The safest approach: treat each -mb word as memorized rather than ruleable once suffixes are added.

Rule 22: Silent "P"

Silent p typically appears in words of Greek origin, often at the start of a word before "s," "n," or "t" sounds, or in a few borrowed French words.

Examples: psychology, pneumonia, pseudonym, receipt, coup, corps, cupboard (silent p mid-word), raspberry

Rule 23: Silent "T" in French-derived words

A number of words borrowed from French keep the French spelling but drop the "t" sound in pronunciation, especially at the end of the word.

Examples: ballet, buffet, gourmet, rapport, debut, depot, valet, mortgage (silent t mid-word, not final)

Rule 24: Silent "H"

Silent h occurs both at the start of certain words (mostly of French/Latin origin) and in the middle of others.

Word-initial silent H: hour, honest, honour, heir, herb (silent in American English; often pronounced in British English)

Mid-word silent H: ghost, exhaust, rhythm, rhyme, vehicle, exhibit

Rule 25: Silent "L"

Silent l typically appears before a consonant such as "k," "m," "f," or "d" in a closed set of common words.

Examples: walk, talk, chalk, calm, palm, half, calf, would, should, could, salmon, folk, yolk

Rule 26: Silent "C"

Silent c mainly appears in a small closed set of words where it neither adds nor changes the sound around it, most often after "s" or before certain consonant clusters.

Examples: muscle, scissors, Czech (silent in some dialects), fascinate is a near-miss to avoid confusing with this group — the clearest and most exam-relevant true example is indict (pronounced "in-DITE," with a fully silent c), which is worth memorizing on its own as a favourite trap word, along with victual (pronounced "vittle").

Rule 27: Doubling (or not) when adding a prefix

Unlike suffixes, prefixes almost never change the spelling of the root word — you simply attach the prefix as-is. The confusion arises when the prefix ends in the same letter that the root begins with, which creates what looks like an unusual double letter but is actually just two separate, correctly spelled parts sitting next to each other.

dis- + satisfied = dissatisfied (two s's: one ending "dis," one starting "satisfied" — NOT "disatisfied") mis- + spell = misspell (two s's — NOT "mispell") un- + necessary = unnecessary (two n's — NOT "unecessary") il- + legal = illegal, ir- + regular = irregular, im- + mature = immature (these prefixes actually change form — in- becomes il-/ir-/im- — before certain letters, which is a different, related pattern worth knowing)

The single biggest source of errors here: dropping one of the doubled letters because it "looks wrong" to double it. Always mentally split the word into prefix + root and check each piece independently: dis + satisfied, mis + spell, un + necessary, over + rate = overrate, under + rate = underrate.

Rule 28: Compound words — one word, two words, or hyphenated

There is no single universal rule here; usage has to be learned word by word, but three broad tendencies help. A compound tends to be written as one word once it is old and extremely common (well-established meaning fused into a single unit); as two words when it is a newer or more transparent combination; and hyphenated when it functions as a single modifier before a noun, or when writing it solid would be visually confusing.

One word (fully fused, very common compounds): classroom, birthday, notebook, background, however, upstairs, weekend, everybody, nevertheless

Two words (still separate, especially noun + noun where each retains its own stress): high school, ice cream, post office, real estate, living room, credit card

Hyphenated (especially compound adjectives before a noun, or to avoid a run of confusing letters): well-known, up-to-date, mother-in-law, self-esteem, re-enter (hyphen avoids the awkward "reenter"), co-operate (traditional British; "cooperate" is now equally common)

Practical exam guidance: when in doubt about a specific compound, check whether it is functioning as an adjective directly before a noun (which favours hyphenation, e.g. "a well-known author") versus standing alone after a verb (which often drops the hyphen, e.g. "the author is well known"). Rule 38 below extends this specific case in more depth.

Rule 29: Homophone traps

Homophones — words that sound identical but are spelled differently and mean different things — are not, strictly, "misspellings" in the traditional sense, but exams test them constantly inside cloze passages and sentence-correction questions because choosing the wrong one is functionally the same error as a spelling mistake: the word on the page is wrong for the sentence. Section 5 of this guide is devoted entirely to homophones with more than eighty pairs and sets; the examples below are simply the ones most likely to appear inside a plain spelling-focused question rather than a dedicated homophone question.

High-frequency homophone pairs/sets to drill:

• their (possessive) / there (place) / they're (they are)
• your (possessive) / you're (you are)
• its (possessive) / it's (it is)
• whose (possessive) / who's (who is)
• affect (usually a verb, "to influence") / effect (usually a noun, "a result")
• principal (head of an institution / main) / principle (a rule or belief)
• stationary (not moving) / stationery (paper products)
• complement (to complete/go well with) / compliment (praise)
• discreet (careful, tactful) / discrete (separate, distinct)
• council (a group of people) / counsel (advice, or to advise)
• elicit (to draw out) / illicit (illegal)
• desert (dry land, or to abandon) / dessert (sweet course)
• born (given birth to) / borne (carried, past participle of "bear")
• cite (to quote) / site (a location) / sight (vision)

Rule 30: Words that double a consonant only in British spelling

Related to Rule 2 but worth stating as its own rule because it is one of the most tested British-vs-American points: British English doubles the final "l" before a vowel suffix even when the last syllable is unstressed, which American English does not do. This is covered in full with a comparison table in Section 4, but the core examples to know now are: travel → travelled/travelling (British) vs traveled/traveling (American); cancel → cancelled/cancelling vs canceled/canceling; model → modelled/modelling vs modeled/modeling; label → labelled/labelling vs labeled/labeling. For Indian competitive exams, default to the doubled British form.

Rule 31: -CEDE, -CEED, and -SEDE endings

All three spellings represent the same Latin root meaning "to go" or "to yield," and the sound is identical across all of them — which is exactly why this trio is one of the most reliable "trap" rules an exam-setter can use. The trick is that -ceed is the rarest ending, restricted to just three English words, and -sede is rarer still, restricted to exactly one.

Only these three words end in -CEED: exceed, proceed, succeed (and their derived forms: exceeding, proceeded, successor)

Only this one word ends in -SEDE: supersede (there is no second example — this is what makes it such a popular single-item trap)

Every other word with this sound ends in -CEDE: precede, concede, recede, accede, intercede, secede

A clean way to lock this in: memorize the three -ceed words and the one -sede word as fixed, closed lists; then treat -cede as the "default" spelling for everything else with this sound. If a question offers "preceed," "precede," and "presede" as options, the closed-list method tells you instantly that only "precede" can be correct, because "preceed" isn't on the three-word -ceed list and "presede" isn't the one -sede word.

Rule 32: Words ending in "-C" insert a "K" before -ING, -ED, -ER, and -Y

A word ending in a hard c sound needs a "k" inserted before any suffix that begins with e, i, or y — otherwise the c would be misread as a soft "s" sound (as it is before those same letters in words like "cent" or "city"). This is a genuinely mechanical, exception-light rule, which makes it a reliable one to memorize outright.

Examples: picnic → picnicking, picnicked, picnicker; panic → panicking, panicked, panicky; traffic → trafficking, trafficked; mimic → mimicking, mimicked, mimicker; frolic → frolicking, frolicked; colic → colicky

Note the exception when the suffix begins with a consonant or with "a"/"o"/"u": no k is needed, since there is no risk of a soft-c misreading — picnic → picnics, panic → panicky is actually the -y case above (still gets the k), but panic → panic-free (hyphenated compound) needs no k. The simplest test: if the next letter after "c" would be e, i, or y, insert the k; otherwise don't.

Rule 33: -FUL never doubles the "L" — but -FULLY does

A suffix that is very frequently misspelled in exactly the opposite direction of what people expect: -ful, when attached directly to a root, always has a single "l," even though the standalone word "full" has two. The doubling only reappears when -ly is added on top of -ful, because that second "l" belongs to "-ly," not to "-ful."

-FUL (single L): careful, hopeful, beautiful, wonderful, grateful, powerful, useful, cheerful, faithful, skilful (British; see Rule 30/Section 4 for the American "skillful")

-FULLY (double L, because -ly is added to -ful): carefully, hopefully, beautifully, wonderfully, gratefully, powerfully, usefully, cheerfully, faithfully

The trap to watch: writing "carefull" (wrongly doubling the l in the base word) or, in the other direction, "carefuly" (wrongly dropping the second l that -ly correctly adds). Say it as two separate mental steps — care + ful, then (care + ful) + ly — and both errors disappear.

Rule 34: Plurals of compound nouns

When a compound noun is made of a noun plus a modifier (an adjective, a preposition, or another noun that describes it), the plural "-s" normally attaches to the head noun — the part that names the actual thing — not to the word at the very end of the compound.

Pluralize the head noun (usually the first word): mother-in-law → mothers-in-law, attorney general → attorneys general, passer-by → passers-by, editor-in-chief → editors-in-chief, commander-in-chief → commanders-in-chief, runner-up → runners-up

When both parts are equally "noun-like" or the compound is solid (written as one word), pluralize normally at the end: spoonful → spoonfuls, cupful → cupfuls, breakthrough → breakthroughs, checkbook → checkbooks

Genuinely dual-acceptable cases where usage has shifted toward end-pluralization in modern informal English: attorney generals (increasingly seen, though attorneys general remains the more "correct" formal choice); court martial → courts martial (formal) or court martials (increasingly common). For exam purposes, default to the traditional head-noun pattern (mothers-in-law, not mother-in-laws) unless the compound is fully fused into one word.

Rule 35: Possessive apostrophe placement (a spelling-adjacent rule)

Strictly, an apostrophe is a punctuation mark rather than a letter, but exams routinely test possessive forms inside "spot the error" and cloze questions because a misplaced apostrophe changes both the meaning and, functionally, the correct written form of the word. The underlying rule is simple once isolated from everything else going on in the sentence: add 's to a singular noun (even one already ending in "s"), and add only an apostrophe to a plural noun that already ends in "s."

Singular possessive (add 's): the student's book, the child's toy, the boss's decision, James's car (also "James' car" is accepted in some British style guides, but "James's" is the safer default for exams)

Plural possessive, noun already ends in -s (add only '): the students' books, the workers' rights, the girls' hostel, the teachers' meeting

Plural possessive, noun does NOT end in -s (add 's, same as singular): the children's toys, the men's department, the women's association, the people's choice

The single most-tested confusion: its (possessive, no apostrophe — like "his" or "her") versus it's (a contraction of "it is" or "it has," always with an apostrophe). This pair is covered again with worked examples in Section 5.

Rule 36: Proper adjectives and nationality words

When a proper noun (a specific name, country, or place) is turned into an adjective, the resulting word is still capitalized, and it very often takes an irregular suffix that has to be learned rather than guessed. Getting the capitalization wrong is a spelling error in the exam sense, since answer keys check capitalization on proper adjectives just as strictly as letter order.

Regular pattern (add -N or -AN): India → Indian, America → American, Africa → African, Korea → Korean, Russia → Russian

Irregular endings that must be memorized: China → Chinese, Japan → Japanese, France → French, Spain → Spanish, Britain → British (not "Britainian"), Switzerland → Swiss, Philippines → Filipino/Philippine (two distinct accepted adjective forms depending on context)

Watch the doubled or shifted letters: Britain → British drops the "-tain" entirely; Wales → Welsh similarly changes shape rather than simply adding a suffix; Scotland → Scottish inserts a "t" that isn't obviously predictable from "Scotland" alone.

Rule 37: Spelling numbers and ordinal words correctly

Numbers written out as words follow their own small set of predictable but frequently botched spelling patterns, and ordinal numbers (first, second, third...) often drop or alter letters from the cardinal number they're built from in ways that trip up even confident writers.

Cardinal numbers that lose a letter compared to their "obvious" spelling: forty (not "fourty," even though it is built from "four"), ninety (built from "nine," but drops nothing — the trap here is the reverse: people wrongly write "ninty")

Ordinal numbers that change more than just adding "-th": nine → ninth (drops the "e"), five → fifth (changes "ve" to "f"), twelve → twelfth (changes "ve" to "f" and adds "th"), forty → fortieth (changes "y" to "ie," following the same y-to-i pattern as Rule 6), eight → eighth (adds only "h," not "th," since the base already ends in a "t"-adjacent sound)

Compound number words: twenty-one, thirty-five, ninety-nine are hyphenated when written out in full as compound numbers from 21 to 99 (except the multiples of ten themselves); this hyphenation rule is tested in formal/descriptive writing sections as much as in pure spelling questions.

Rule 38: Hyphenating compound adjectives before a noun

This extends Rule 28 specifically for the case that generates the most exam questions: two or more words functioning together as a single adjective immediately before the noun they describe are hyphenated; the same words, used predicatively after a linking verb, usually are not.

Hyphenated before the noun: a well-known author, a fast-moving train, a five-year-old child, a state-of-the-art facility, a high-risk investment, a well-behaved student, a two-thirds majority

Not hyphenated after the linking verb: the author is well known, the train was fast moving, the child is five years old, the facility is state of the art, the investment is high risk

Numbers combined with a unit before a noun are also hyphenated: a ten-day trip, a two-hour delay, a twenty-page report, a three-month course — but the same numbers used as a plain plural noun phrase are not: the trip lasted ten days, the delay was two hours long. The consistent test across every example: hyphenate only when the phrase sits directly in front of the noun it modifies, functioning as one combined descriptive unit.

Rule 39: -EOUS vs -IOUS

Both endings sound similar (roughly "-us" with a preceding vowel glide) and both attach to Latin-derived roots, but -eous and -ious are not interchangeable, and which one a given word takes has to be learned rather than deduced from sound alone.

-EOUS words: courageous, gorgeous, outrageous, advantageous, gaseous, righteous, spontaneous, simultaneous

-IOUS words: gracious, curious, furious, anxious (an -xious variant of the same family), delicious, suspicious, ambitious, mysterious

A partial helper: words that keep a soft "g" or "c" sound before the ending (courageous, outrageous, advantageous) tend to take -eous, because the extra "e" is doing the same job it does in "noticeable" and "changeable" — keeping the preceding consonant soft (see Rule 4). Words without that soft-consonant requirement default to -ious far more often, but this is a helper, not a guarantee — always cross-check against the lists above.

Rule 40: British "-OUR" words drop the "U" before certain suffixes

A pattern many candidates never notice until it costs them a mark: several of the British -our words from Rule 30/Pattern A (Section 4) drop the "u" when a suffix beginning with a vowel is added, even though the base word itself keeps the "u" in British spelling. This happens because the "u" was only ever there to preserve a specific unstressed vowel sound in the base word, and that sound shifts once the stress moves under a suffix.

U is dropped before the suffix: humour → humorous, honour → honorary/honorific, vigour → vigorous, glamour → glamorous, rigour → rigorous

U is KEPT before other suffixes (no vowel-initial suffix, or the suffix doesn't shift stress): colour → colourful, colourless, colourblind; favour → favourable, favourite; humour → humourless (British retains "u" here, unlike "humorous")

The single most tested pair from this rule: humour (noun, keeps the u) versus humorous (adjective, drops the u) — candidates who confidently spell "humour" correctly frequently then misspell "humorous" as "humourous" by simply not realizing the u disappears under this specific suffix.

Rule 41: Silent "U" after "G"

A word-initial or mid-word gu- cluster very often carries a silent "u" whose only job is to keep the "g" hard (as in "go"), preventing it from softening the way g does before e/i/y (as in "gem" or "giant").

Examples: guard, guess, guest, guide, guitar, guarantee, guilty, guild, guise, vague

Contrast to notice: without the silent u, "gest" or "gide" would tempt a soft-g pronunciation; the u is doing real phonetic work even though it isn't itself pronounced. This is a useful memory anchor when a word "feels like it's missing a letter" — check whether a silent u after g is the missing piece.

Rule 42: Silent "N" after "M" resurfaces before a vowel suffix

Closely related to Rule 21 (silent b after m) but for a different consonant: when a word ends in -mn, the "n" is silent in the base word, but it becomes pronounced (and must still be written) once a suffix beginning with a vowel is added.

Silent N in the base word: autumn, column, hymn, condemn, solemn, damn

N becomes pronounced (and is never dropped in spelling) once a suffix is added: autumn → autumnal, column → columnar, hymn → hymnal, condemn → condemnation, solemn → solemnity, damn → damnation

The trap to watch: candidates sometimes "correct" the spelling of the suffixed form by dropping the n, assuming it should stay silent the way it was in the base word — but the n was never actually absent from the spelling, only from the pronunciation, so every suffixed form keeps it.

Rule 43: Noun-with-C, verb-with-S — the "practice/practise" pattern

In formal British spelling, a small but high-frequency group of words spells the noun form with a "c" and the verb form with an "s," even though both are pronounced identically (or nearly so). This is distinct from the -ence/-ense British/American split in Section 4 (Pattern E) because both spellings are British here — the split is between noun and verb, not between British and American.

practice (noun) / practise (verb): "Regular practice improves accuracy" (noun) vs. "You must practise your spelling daily" (verb)

licence (noun) / license (verb): "He renewed his driving licence" (noun) vs. "The authority may license new vendors" (verb)

advice (noun) / advise (verb): "Her advice was useful" (noun) vs. "Please advise the candidates" (verb)

Note on scope: American English does not observe this noun/verb split at all — it uses "practice" and "license" for both noun and verb, and does not use "practise" as a spelling at all. For Indian exams set to British convention, the noun/verb split above should be treated as the expected standard, especially in descriptive-answer sections where verb and noun forms of the same word often appear in the same paragraph.

Rule 44: "ALL-" compounds drop one "L" — except when the words stay separate

When "all" is fused into a following word to form a single compound, it drops one of its two l's, leaving a single "l" in the compound even though "all" itself has two. When the same words are kept as two separate words instead, both retain their full spelling, and the meaning is often different.

Fused compound, single L: almost, already, altogether, although, always, almighty

Kept as two separate words, meaning shifts accordingly: "all right" (acceptable/satisfactory; "alright" is common in informal writing but considered non-standard in formal exam answers — always write "all right" as two words with two l's in formal contexts), "all together" (everyone/everything in one place: "the family sat all together") versus "altogether" (entirely, completely: "his explanation was altogether unconvincing") — these last two are a genuine homophone-adjacent pair covered again in Section 5.

Rule 45: One-letter meaning-changers (near-miss confusable words)

A closing rule for this section: a small set of very common word pairs differ by exactly one letter, are not true homophones (they don't sound identical), but are misspelled into each other constantly under time pressure because the visual difference is so small. These are worth drilling as pairs rather than as isolated words.

lose (to misplace/fail to win) vs. loose (not tight): "Don't lose your ticket" vs. "The rope was loose"

quite (to a considerable extent) vs. quiet (making little noise): "It was quite cold" vs. "The library was quiet"

breath (noun, the air itself) vs. breathe (verb, the action): "Take a deep breath" vs. "Remember to breathe slowly"

cloth (noun, fabric) vs. clothe (verb, to dress): "A piece of cloth" vs. "Parents must clothe and feed their children"

dessert (sweet course) vs. desert (dry land / to abandon): already listed as a homophone-style pair in Rule 29, but included here too because the doubled "s" is the actual point of confusion, not the sound.

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