Frequently Misspelled Words and Patterns

You do not need to memorize a dictionary. Most misspellings come from a small group of common words and a few patterns. Learn these first, and then keep a short list of the words you personally get wrong.

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Words Worth Learning First

These words appear often in essays and are often misspelled. The right column shows the error to avoid.

Correct	Common error	Memory cue
definitely	definately	It contains finite.
government	goverment	Govern + ment.
environment	enviroment	It contains iron: env-iron-ment.
important	importent	It ends in -ant.
different	diffrent	Say all three syllables: dif-fer-ent.
necessary	neccessary	One c, two s: one collar, two sleeves.
separate	seperate	There is a rat in sep-a-rat-e.
receive	recieve	E before i after c.
believe	beleive	There is a lie in be-lie-ve.
achieve	acheive	I before e, as in believe.
because	becuase	Check the -au- in the middle.
beginning	begining	Double n (see the rule below).
business	bussiness	Bus + i + ness, with one s in the middle.
accommodate	accomodate	Double c, double m.
recommend	reccomend	One c, double m.
argument	arguement	Argue drops its e here.
knowledge	knowlege	It contains ledge.
opportunity	oppurtunity	It starts with opp-or-.
technology	tecnology	It starts with tech.
successful	sucessful	Double c, double s, one l at the end.
foreign	foriegn	An exception to i before e.
grammar	grammer	It ends in -ar.

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Five Patterns That Explain Many Errors

1. I before e, except after c

This rule works when the sound is ee: believe, achieve, field, and, after c, receive, ceiling, perceive.

It has exceptions, so learn these separately: weird, seize, either, their, foreign.

2. Doubling the final consonant

When you add a suffix that starts with a vowel (-ing, -ed, -er), double the final consonant if the word ends in one vowel plus one consonant and the stress falls on the last syllable.

Base word	Stress	With suffix
begin	be-GIN	beginning
occur	oc-CUR	occurred
refer	re-FER	referred
visit	VIS-it	visited
open	O-pen	opening

One-syllable words follow the same pattern: stop, stopped; plan, planning.

3. Dropping the silent e

Drop a final silent e before a suffix that starts with a vowel, and keep it before a suffix that starts with a consonant.

Vowel suffix: drop e	Consonant suffix: keep e
write, writing	care, careful
make, making	hope, hopeless
believe, believable	excite, excitement

Learn two common exceptions: argument and truly.

4. Changing y to i

When a word ends in a consonant plus y, change y to i before most suffixes: study, studies; happy, happiness; carry, carried.

Keep the y after a vowel (play, played) and before -ing (study, studying).

5. Prefixes and -ful

A prefix does not change the spelling of the base word, which is why some words have a double letter and others do not.

• dis + appear = disappear
• mis + spell = misspell
• un + necessary = unnecessary

The suffix -ful has one l: useful, careful, successful. If you add -ly to a word ending in -l, both letters stay: final, finally; real, really.

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American or British Spelling

Both systems are correct. What matters is that you use one consistently within a piece of writing.

American	British
color	colour
center	centre
organize	organise
analyze	analyse
traveled	travelled

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Quick Summary

Tool	Use it for
The word table	Learning the most common problem words first
Memory cues	Words that no rule explains, such as separate
The five patterns	Predicting spellings you have not memorized
Your own list	The words that you personally misspell again and again

Apostrophes

Apostrophes have two jobs: they show that letters are missing, and they show possession. Almost every apostrophe error comes from using one for a third job it does not have, which is making a word plural.

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Job 1: Contractions

An apostrophe marks the place where letters were removed.

Full form	Contraction
it is, it has	it's
do not	don't
they are	they're
who is, who has	who's

Many formal essays avoid contractions altogether. If your writing is formal, write the full form: it is, do not, cannot.

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Job 2: Possession

An apostrophe shows that something belongs to someone or something. Choose the form by asking whether the owner word already ends in a plural -s.

Owner	Rule	Example
Singular noun	Add 's	the student's essay (one student)
Plural noun ending in -s	Add only '	the students' essays (several students)
Plural noun not ending in -s	Add 's	people's opinions, children's books, women's rights

Singular names ending in -s appear both ways, as James's and James'. Choose one form and use it consistently.

A missing possessive

One very common error is leaving out the possessive completely.

Not	Correct
in many people eyes	in many people's eyes
today world	today's world
the company success	the company's success

If you can rewrite the phrase with of, it probably needs a possessive: the eyes of many people becomes many people's eyes. Time expressions work the same way: today's world, a year's experience, two weeks' notice.

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What Apostrophes Do Not Do

They do not make plurals

Not	Correct
Many student's passed.	Many students passed.
We bought two computer's.	We bought two computers.
Both teacher's agreed.	Both teachers agreed.

Before you write an apostrophe, ask: does this word own something, or is a letter missing? If neither is true, remove the apostrophe.

Possessive pronouns do not take one

These words already show possession, so they never take an apostrophe: its, hers, his, ours, yours, theirs, whose.

Not	Correct
The city improved it's parks.	The city improved its parks.
The decision is your's.	The decision is yours.
The idea was their's.	The idea was theirs.

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Quick Summary

Question	If yes
Are letters missing?	Use an apostrophe where they were
Does a singular noun own something?	Add 's
Does a plural noun ending in -s own something?	Add '
Does a plural noun without -s own something?	Add 's
Is the word only plural?	No apostrophe
Is it a possessive pronoun, such as its?	No apostrophe

Commas and Basic Punctuation

You do not need dozens of rules to punctuate an essay well. Most comma errors fall under the five rules below. Learn when a comma is needed, and also when it does not belong.

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Five Rules for Commas

1. After an introductory word, phrase, or clause

However, the results were surprising.

In addition, the program reduced costs.

Although the sample was small, the findings were clear.

Linking words at the start of a sentence, such as also, however, therefore, and for example, are the most frequent place this comma goes missing.

2. Between items in a list

The course covers grammar, vocabulary, and organization.

The comma before and is called the serial comma. Some style guides use it and others do not. Either is fine if you stay consistent.

3. Before a coordinating conjunction that joins two complete sentences

The conjunctions are for, and, nor, but, or, yet, so.

The experiment failed, but the team learned from it.

There is no comma if the second part is not a complete sentence:

The team failed but learned from it.

The Compound Sentences module covers this rule in depth.

4. Around extra information

If you can remove the information and the sentence still identifies the same person or thing, put commas around it.

My brother, who lives in Toronto, is a nurse.

If the information tells us which one, it is essential, so it takes no commas.

Students who sleep well usually perform better.

This sentence is about only the students who sleep well. With commas, it would suggest that all students sleep well.

5. Before a direct quotation

The author writes, "Practice changes the brain."

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Where a Comma Does Not Belong

Do not put a comma...	Not	Correct
Between a subject and its verb	The main reason for this change, is cost.	The main reason for this change is cost.
Before a that clause	She said, that the plan failed.	She said that the plan failed.
Before a because clause, in most sentences	We stayed inside, because it rained.	We stayed inside because it rained.
Between two complete sentences on its own	The plan failed, we tried again.	The plan failed, so we tried again.

The last error is called a comma splice. The Run-ons and Fragments module shows several ways to fix it.

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Semicolons and Colons

A semicolon joins two closely related complete sentences.

The evidence was limited; the trend was still clear.

Words like however and therefore do not join sentences on their own. Use a semicolon or a period before them, and a comma after them.

Not	Correct
The evidence was limited, however, the trend was clear.	The evidence was limited; however, the trend was clear.

A colon comes after a complete sentence and introduces what follows.

The report has one clear goal: to reduce waste.

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Capital Letters

Capitalize the first word of a sentence, the pronoun I, and proper nouns, including names of people, places, organizations, languages, and nationalities. Days and months are also capitalized, but seasons are not.

In March, I started studying English at a university in Canada.

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Quick Summary

Situation	Punctuation
Opening word or phrase	Comma after it
Three or more list items	Commas between them
but, and, or so joining two complete sentences	Comma before the conjunction
Extra information	Commas around it
Essential information	No commas
Between subject and verb	No comma
Before however joining two sentences	Semicolon or period, with a comma after

Proofreading Routine and Quick Reference

Knowing a rule and applying it in your own writing are different skills. A quiz can show that you recognize the right form, but the real test is whether the error disappears from your next essay. A short routine closes that gap.

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Why You Miss Your Own Errors

When you read your own writing, your brain sees what you meant to write, not what is on the page. Proofreading works better when you change how you read.

Many misspellings are not words you never learned. They are typing slips, such as a dropped or swapped letter: studnet for student, or seriosly for seriously. You already know these words, so a careful final read is often all it takes to catch them.

A Five-Step Routine

1. Finish first. Do not stop to fix spelling while you are developing ideas. Check it at the end.
2. Read aloud, slowly. Reading aloud helps you notice missing words and missing commas after opening phrases.
3. Search for your risky words. Look at each its, their, there, your, and affect or effect, and check the meaning.
4. Check every apostrophe. Is a letter missing, or does the word own something? If not, remove it.
5. Read the last sentence first. Then work backward. Taking sentences out of order makes it easier to see the words instead of the ideas.

In a timed exam, you may only have two or three minutes for this. Spend them on steps 3 and 4, because those errors are the quickest to find and fix.

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Keep a Personal Error List

Most writers misspell the same small set of words again and again. A list of 10 to 20 of your own errors is more useful than any general list.

1. When your essay feedback points out a misspelled or confused word, write down the correct form.
2. Add a memory cue if you can think of one.
3. Look over the list before you write your next essay.
4. Remove a word once you have used it correctly several times.

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What Spell-Check Can and Cannot Do

Spell-check is a useful first pass, but it has limits.

Spell-check usually catches	Spell-check may miss
Words that do not exist, such as goverment	Real words in the wrong place, such as their for there
Many typing errors, such as teh	Missing possessives, such as people eyes
	Many comma errors

Some timed exams and writing tools offer no spell-check at all, so build these habits before you need them.

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One-Page Checklist

Check	Question to ask
its / it's	Can I say it is or it has? Then use it's.
their / there / they're	Can I say they are? Can I say our?
your / you're	Can I say you are?
whose / who's	Can I say who is or who has?
affect / effect	Verb: usually affect. Noun: usually effect.
Possessive	Can I rewrite it with of? Then it probably needs an apostrophe.
Plural	Is the word only plural? Then remove the apostrophe.
Opening phrase	Does the sentence begin with a linking word or phrase? Add a comma after it.
Subject and verb	Is there a comma between them? Remove it.
However	Does it join two complete sentences? Use a semicolon before it and a comma after it.

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Quick Summary

Habit	Why it works
Proofread as a separate step	You can focus on the words, not the ideas
Read aloud and read backward	You see what is on the page, not what you meant
Keep a personal list	It targets the errors you actually make
Do not rely on spell-check alone	It misses correctly spelled words in the wrong place