Contractions in Grammar: Definition, Types, Rules and Complete Guide

Some of the most commonly written and spoken words in the English language are not technically words at all in their contracted form: they are two words compressed into one, with an apostrophe marking the spot where letters have been removed. 'Don't' is 'do not'. 'I'm' is 'I am’. 'It's' is 'it is' or 'it has’. These compressed forms are called contractions in grammar, and they appear in virtually every piece of informal English ever written or spoken, making them one of the most practically important topics any English learner can study.

This page provides the most comprehensive guide to contractions in grammar available. It covers the precise definition, the purpose they serve, every major type, the complete list of contractions in grammar, the rules governing their formation and use, contractions in grammar examples across a wide range of contexts and comprehensive practice exercises.

 

Table of Contents

• Define Contractions in Grammar
• What is the Purpose of Contractions in Grammar?
• Rule of Contractions in Grammar
• Types of Contractions in Grammar
• List of Contractions in Grammar: Complete Reference
• Practice Exercises

 

Define Contractions in Grammar

To properly define contractions in grammar, it helps to understand the literal meaning of the word 'contraction' itself: to contract means to shorten or compress. This is precisely what a grammatical contraction does.

Simple definition:

To define contractions in grammar: a contraction is a shortened form of one or two words in which one or more letters are omitted and an apostrophe is used to mark the omission.

Key features of contractions in grammar:

• They combine two words into one shorter form.
• One or more letters are removed in the process.
• An apostrophe always marks exactly where the letters were removed.
• They carry the same meaning as the full, uncontracted form.
• They are characteristic of informal and conversational English.

Examples at a glance:

• 'do not' → don't (apostrophe replaces the 'o' of 'not')
• 'I am' → I'm (apostrophe replaces the 'a' of 'am')
• 'he is' → he's (apostrophe replaces the 'i' of 'is')
• 'they will' → they'll (apostrophe replaces 'wi' of 'will')
• 'would not' → wouldn't (apostrophe replaces the 'o' of 'not')

How Contractions are Formed

Understanding exactly how contractions in grammar are formed makes the apostrophe rule completely clear and eliminates a major source of spelling errors.

The basic mechanism:

• Two words are placed together.
• One or more letters are removed from one (or occasionally both) of the words.
• An apostrophe is placed at the exact position where the letters were removed.

Formation examples:

 

Full Form	Letters Removed	Contraction
do not	'o' from 'not'	don't
I am	'a' from 'am'	I'm
he is	'i' from 'is'	he's
they will	'wi' from 'will'	they'll
would not	'o' from 'not'	wouldn't
she has	'ha' from 'has'	she's
I would	'woul' from 'would'	I'd
we are	'a' from 'are'	we're

 

The apostrophe rule:

The apostrophe in a contraction always sits in the exact spot where the missing letters were. It does not appear before the contracted word or after it: it appears precisely where the omission occurred.

• 'do not' → 'do not' → 'do n_t' → don't (apostrophe replaces the 'o')
• 'I am' → 'I am' → 'I _m' → I'm (apostrophe replaces the 'a')

 

What is the Purpose of Contractions in Grammar?

Understanding what is the purpose of contractions in grammar explains why they exist in the language and why they are so consistently used in everyday English.

Purpose 1: Reflecting Natural Speech

The primary purpose of contractions in grammar is to represent how people actually speak. In natural, unscripted speech, almost no one says 'I am going to the market.’ They say 'I'm going to the market.' Writing contractions reflects this natural rhythm and makes written dialogue and informal text feel authentic rather than stiff.

Purpose 2: Economy of Expression

Contractions allow the same meaning to be conveyed in fewer letters and syllables, making both speech and writing more efficient. In contexts where pace and flow matter, such as conversation, storytelling and informal writing, this economy of expression is genuinely valuable.

Purpose 3: Signalling Register and Tone

The presence or absence of contractions is one of the most reliable signals of formality in English. Writing 'I'm afraid we cannot accommodate your request' is warmer and more conversational than 'I am afraid we cannot accommodate your request.' Choosing whether or not to use a contraction is a tonal decision as much as a grammatical one.

Purpose 4: Creating Natural Rhythm in Writing

In creative writing and personal essays, contractions help maintain a natural rhythm that makes writing feel conversational and engaging rather than formal and distant.

 

Rule of Contractions in Grammar

The following are the complete rules of contractions in grammar that every student should understand and apply consistently.

Rule 1: The Apostrophe Replaces the Missing Letters Exactly

The apostrophe is placed at the precise position where letters were omitted. This is the single most important rule of contractions in grammar.

• 'can not' → can't (the 'no' is dropped; apostrophe sits where 'no' was)

Rule 2: The Spelling of the Remaining Letters Does Not Change (with One Exception)

When letters are removed and the two words are joined, the spelling of the remaining parts stays the same.

• 'they are' → they're (the 'a' is dropped; 'they' and 're' stay the same)

Exception: 'will not' → won't (not 'willn't'). This is the most notable spelling irregularity in English contractions.

Rule 3: Contractions Should Not Be Used in Formal Writing

In formal academic essays, official reports, legal documents and formal correspondence, the full form should always be used instead of the contraction.

• Informal: 'I'm not sure this is the right approach.'
• Formal: 'I am not sure this is the right approach.'

Rule 4: Contractions Should Not Be Confused with Possessives

• 'It's' (contraction for 'it is' or 'it has') is not the same as 'its' (the possessive pronoun). 
• 'You're' (contraction for 'you are') is not the same as 'your' (possessive pronoun). 

Rule 5: Do Not Use Contractions Ambiguously in Writing

In some sentences, a contraction can be ambiguous when read aloud. 'She'd' can mean 'she would' or 'she had'. In formal or technical writing, it is better to use the full form to ensure clarity.

 

Types of Contractions in Grammar

There are several distinct types of contractions in grammar, categorised by which combination of words is being contracted.

 

Type	What Is Contracted	Examples
Verb + not	Auxiliary verb + not	don't, can't, won't, isn't
Pronoun + be	Pronoun + is/are/am	I'm, he's, we're, they're
Pronoun + have	Pronoun + have/has	I've, she's, we've, they've
Pronoun + will	Pronoun + will	I'll, she'll, we'll, they'll
Pronoun + would/had	Pronoun + would or had	I'd, she'd, we'd, they'd
Noun + is/has	Noun + is or has	John's, the cat's
Who/what + is/has	Interrogative + is/has	who's, what's

 

List of Contractions in Grammar: Complete Reference

The following is the complete list of contractions in grammar, organised by category.

A. Contractions with 'Not'

These are among the most frequently used contractions in grammar, combining auxiliary verbs with 'not'.

 

Full Form	Contraction
are not	aren't
cannot	can't
could not	couldn't
did not	didn't
do not	don't
does not	doesn't
had not	hadn't
has not	hasn't
have not	haven't
is not	isn't
might not	mightn't
must not	mustn't
need not	needn't
ought not to	oughtn't to
shall not	shan't
should not	shouldn't
was not	wasn't
were not	weren't
will not	won't
would not	wouldn't

 

B. Contractions with Pronouns and 'Be'

 

Full Form	Contraction
I am	I'm
you are	you're
he is	he's
she is	she's
it is	it's
we are	we're
they are	they're
that is	that's
there is	there's
here is	here's
who is	who's
what is	what's
how is	how's

 

C. Contractions with Pronouns and 'Have'

 

Full Form	Contraction
I have	I've
you have	you've
he has	he's
she has	she's
it has	it's
we have	we've
they have	they've
who has	who's
what has	what's

 

Note: 'he's', 'she's', 'it's' and 'who's' can each represent either 'is' or 'has'. The meaning is determined by context.

• 'He's tired.' → He is tired.
• 'He's been waiting.' → He has been waiting.

 

D. Contractions with Pronouns and 'Will'

 

Full Form	Contraction
I will	I'll
you will	you'll
he will	he'll
she will	she'll
it will	it'll
we will	we'll
they will	they'll
that will	that'll
there will	there'll
who will	who'll
what will	what'll

 

E. Contractions with Pronouns and 'Would' or 'Had'

 

Full Form	Contraction	Also Represents
I would	I'd	I had
you would	you'd	you had
he would	he'd	he had
she would	she'd	she had
it would	it'd	it had
we would	we'd	we had
they would	they'd	they had
who would	who'd	who had

 

Note: The '-'d' contraction can represent either 'would' or 'had’. Context determines the meaning.

• 'She'd come if she could.' → She would come.
• 'She'd already left.' → She had already left.

 

F. Contractions in Grammar Examples: In Sentences

The following contractions in grammar examples demonstrate a wide range of contracted forms used naturally in context.

Contractions with 'not':

• 'She doesn't know the answer.'
• 'They couldn't attend the meeting.'
• 'He won't be coming tonight.'
• 'We haven't finished yet.'
• 'Isn't she the new manager?'

Contractions with pronouns and 'be':

• 'I'm going to the library after school.'
• 'You're the best player on the team.'
• 'He's been working here for five years.'
• 'We're planning a surprise party.'
• 'They're not ready yet.'

Contractions with pronouns and 'have':

• 'I've already eaten my lunch.'
• 'You've done a wonderful job.'
• 'She's been studying for hours.'
• 'We've never visited that museum.'
• 'They've finally moved to the new house.'

Contractions with pronouns and 'will':

• 'I'll meet you at the station at noon.'
• 'She'll be arriving tomorrow morning.'
• 'We'll have to rethink the entire plan.'
• 'They'll be pleased with the outcome.'
• 'It'll be a long journey.'

Contractions with pronouns and 'would' or 'had':

• 'I'd love to come if I could.'
• 'He'd already finished by the time we arrived.'
• 'She'd been waiting for over an hour.'
• 'We'd rather stay at home tonight.'
• 'They'd never seen anything like it.'

 

Practice Exercises

A. Underline every contraction in the following passage. Write the full form beside each one.

I'm not sure what's happening, but it seems like they've forgotten about the meeting. She wouldn't have cancelled without telling us, would she? I'll call her now. If she doesn't answer, we'll just have to wait. You're the one who sent the invitation, aren't you? Let's hope it's not too late to sort this out.

B. Write the correct contraction for each full form.

1. do not
2. I have
3. they are
4. will not
5. she would
6. could not
7. we are
8. it is
9. you will
10. was not
11. I had
12. who is
13. should not
14. he has
15. let us

C. Write the full form of each contraction.

1. I'm
2. she'll
3. couldn't
4. they've
5. won't
6. it's (in 'It's been three days.')
7. I'd (in 'I'd love to come.')
8. we're
9. who's
10. you'd

D. Classify each contraction below by its type: verb+not, pronoun+be, pronoun+have, pronoun+will, or pronoun+would/had.

1. I've
2. they'll
3. isn't
4. she's (as in 'she is')
5. we'd
6. mustn't
7. you're
8. he'll
9. haven't
10. I'd

E. Each sentence contains an error related to a contraction. Identify and correct each error.

1. The cat licked it's paws after the bath.
2. Your going to be very surprised by the news.
3. She should of told him earlier.
4. Is'nt she the new head of the department?
5. They're house is at the end of the road.
6. Its been a very long and difficult week.
7. He ca'nt come to the meeting today.
8. Whose coming with us to the museum?
9. I could of handled that situation better.
10. Dont forget to bring your umbrella.