Common Errors in English: A Complete Guide

Most English mistakes are not random. A small group of confusing words and rules cause a large share of the errors that even careful writers make. Learn this group once, and your writing becomes cleaner almost overnight.

This guide gathers the most common errors in one place and shows how to fix each one. It covers words that sound alike, pronoun and agreement problems, fewer and less, sentence-level errors such as comma splices and dangling modifiers, apostrophes and spelling, and the "rules" that turn out to be myths. It also shows you how to build a personal error list and a three-pass proofreading routine, with two worked examples, a checklist and ten practice questions.

It builds on Parts of Speech, Sentence Structure, Punctuation Rules and Tenses & Verb Forms. Spelling in this guide follows British English.

1.Why the Same Errors Keep Appearing

Errors repeat for four main reasons:

• Sound-alike words. There, their and they're sound the same, so your ear cannot help you. Only meaning and grammar can.
• Spoken habits. We say "should of" and "me and John went" without noticing, and those habits slip into writing.
• Rules applied half-way. A student learns "use fewer for things you can count" and then overuses it, or remembers "i before e" and forgets the exceptions.
• Typing speed. Fast typing and autocorrect produce real words in the wrong place.

It also helps to separate errors from choices. An error breaks a convention that careful readers expect in standard written English (for example, could of). A choice is a matter of style or formality (for example, using less in everyday speech where formal writing prefers fewer). This guide marks the difference, because you need to fix the first kind and may only need to think about the second.

2.Words That Sound Alike (or Nearly Alike)

These pairs and groups cause the most trouble. Read each row slowly, then use the memory tip.

Other everyday slips. Write should have, could have and would have, never "should of": we say them as should've, which sounds like should of. Write a lot as two words (never "alot"). Write every day as two words for "each day" and everyday as one word for "ordinary" (everyday clothes). Write maybe for "perhaps" and may be for "might be" (It may be late).

3.Pronoun Problems: I / Me, Who / Whom, Myself

I or me? The confusion happens mostly with two people. Remove the other person and test each pronoun alone.

Who or whom? Use who when the answer would be he, she, they. Use whom when it would be him, her, them. Who called you? (He called.) To whom should I write? (Write to him.) In everyday speech, who is common even where whom is traditional, but formal writing and exams usually expect whom after a preposition.

Myself. Myself is for when you are doing something to yourself (I taught myself to type) or for emphasis (I did it myself). It is not a fancier word for I or me. Write Please contact Sara or me, not "Sara or myself".

Pronoun agreement. A pronoun should match the word it refers to. Write Students should bring their books, not "Students should bring his book". For a single person of unknown gender, many style guides now accept the singular they (Everyone brought their own lunch). Check which form your exam board or school prefers.

4.Subject-Verb Agreement

A singular subject takes a singular verb, and a plural subject takes a plural verb. Errors usually come when other words stand between the subject and the verb.

• Phrases in the middle. The box of pencils is on the desk. The students in the front row are talking.
• Each, every, one of, either, neither. Each of the boys has a book. One of my friends is coming. Neither of the answers is correct. This is the traditional rule used in exams. In casual speech, many people say "Neither of the answers are correct", but use the singular in formal writing.
• There is / there are. The verb agrees with what comes after it: There is a problem. There are two problems.
• Groups (collective nouns). In British English, a word such as team or committee may take a singular or plural verb (The team is ready / The team are ready), depending on whether you think of one unit or its members. Be consistent within a sentence.
• Two subjects with "and". Maths and science are my favourite subjects. (A plural subject.)

5.Fewer or Less, Many or Much, Number or Amount

The basic rule is simple. Use fewer with things you can count one by one, and less with things you cannot: fewer people, fewer chairs, fewer mistakes; less water, less time, less information. In the same way, use many and number of with countable nouns (many books, a large number of students), and much and amount of with uncountable nouns (much rice, a small amount of money).

Three details make the picture accurate:

• Time, money, distance and weight usually take less than because we think of the amount as one thing: It cost less than five pounds. He has lived there less than three weeks.
• Informal usage. Dictionary writers note that less is very common in everyday speech even with countable nouns, as on the sign "10 items or less". In careful writing and exams, use fewer for countable nouns.
• Quick test. Put three before the noun. "Three chairs" works, so use fewer chairs. "Three water" does not, so use less water.

6.Sentence-Level Errors

Fragments, run-ons and comma splices

A fragment is an incomplete sentence (Because it was raining.). A run-on joins two complete sentences with nothing at all (It was raining we stayed inside.). A comma splice joins them with only a comma (It was raining, we stayed inside.). There are four standard ways to repair a comma splice or run-on:

Dangling and misplaced modifiers

A modifier must sit next to the word it describes. A dangling modifier has nothing sensible to describe: Walking to the store, the rain started. (The rain was not walking.) Fix it by naming the doer: Walking to the store, I got caught in the rain. A misplaced modifier is in the wrong place: I only ate the cake (and did nothing else with it) versus I ate only the cake (nothing else). Put only, almost and nearly directly before the word they limit.

Faulty parallelism

Items in a list should have the same form. Write She likes swimming, running and cycling, not "She likes swimming, to run and cycling".

Tense shifts

Do not switch tenses without a reason. Write He opened the door and saw a letter, not "He opened the door and sees a letter".

Double negatives

Standard English uses one negative for one idea: I don't know anything or I know nothing, not "I don't know nothing". Many dialects and other languages do use two negatives for emphasis, but standard written English does not. Do not confuse this with a deliberate pair such as not unhappy, which is a style choice meaning "fairly content".

7.Apostrophes and Spelling Traps

Plurals do not need apostrophes. Write apples and bananas, the 1990s, two CDs. A few rare exceptions exist, such as lower-case letters (mind your p's and q's), but in everyday writing, treat an apostrophe before a plural s as an error.

Possession. Add 's to a singular noun (the boy's bag) and only an apostrophe to a regular plural ending in s (the boys' bags). Irregular plurals take 's (the children's room).

Common misspellings and tips:

British spelling uses colour, favourite, centre, organise, travelling. American spelling uses color, favorite, center, organize, traveling. Both are correct in their own system. The important rule is to choose one and use it consistently. Match the spelling your school, exam board or reader expects.

8.Why Spell-Check Is Not Enough

A spell-checker looks for words that do not exist. It cannot tell you that a real word is in the wrong place. This sentence passes most spell-checks: "Their going to loose the match, but there coach is quiet happy." Every word is a real word, yet there are four errors. Grammar checkers help, but they sometimes suggest wrong changes, so treat their advice as a prompt to think, not an order. The only dependable method is a careful human read, aloud if possible.

9."Rules" That Are Really Myths

Some rules taught in school are not errors at all. Usage guides and dictionary publishers say these are acceptable in standard English:

• Ending a sentence with a preposition. Which team are you playing for? is natural. Avoiding it can make writing stiff.
• Splitting an infinitive. To boldly go and to really enjoy are acceptable, especially with one short word between to and the verb.
• Beginning a sentence with "and", "but" or "because". Acceptable if the sentence is complete and not overused.
• Starting a sentence with "however". Acceptable; just punctuate it correctly.

Your teacher may still prefer to avoid them in exams, and that is a reasonable style preference to follow. But do not "correct" them as if they were errors in other people's writing.

10.How to Stop Repeating the Same Errors

Do not try to memorise every rule. Instead, find your own five most common errors and fix them one at a time.

1. Collect. Look at corrected work, teacher comments and old drafts. Write down each error and the correct form.
2. Rank. Choose the five that appear most often.
3. Practise. Write three new sentences for each, using the correct form.
4. Test. After a week, check whether the errors have gone from your new writing.
5. Replace. When one is fixed, move the next error up your list.

11.Worked Examples

12.Your Proofreading Checklist

For more on editing, see Editing Your Own Work.

13.Common Mistakes When Fixing Errors

14.Common Myths About Errors

15.Key Terms

16.Why This Matters

Small errors change how readers judge your ideas. A single "their" for "there" will not ruin an essay, but a page full of such slips makes a good argument look careless, and in exams, errors can cost marks. The reassuring fact is that a small group of errors causes most of the damage, so a short personal list and a calm proofreading routine can raise the quality of all your writing. Continue with Editing Your Own Work and Formal vs. Informal English.