A contraction shortens a word or group of words by replacing missing letters with an apostrophe. In English, contractions often combine a subject with a verb or a verb with not. Contractions are common in speech and informal writing. The full forms are used in formal writing and for emphasis.

Be forms contract with subject pronouns to create short forms like I'm, you're, he's, she's, it's, we're, and they're. The apostrophe shows the missing letters from am, are, or is. These contractions are frequent in conversation and informal texts.

Subject	Form
I	I'm
you	you're
he	he's
she	she's
it	it's
we	we're
they	they're

Have contracts with pronouns as I've, you've, we've, and they've. Has contracts as he's and she's, which can mean he has or she has, depending on context. The contraction shows missing letters from have or has.

Subject	Form
I	I've
you	you've
we	we've
they	they've

Will contracts with pronouns as I'll, you'll, he'll, she'll, it'll, we'll, and they'll. The contraction 'll attaches to the subject and replaces the missing letters of will. This form is common when talking about the future in spoken English.

Subject	Form
I	I'll
you	you'll
he	he'll
she	she'll
it	it'll
we	we'll
they	they'll

Would contracts as 'd and attaches to pronouns to form I'd, you'd, he'd, she'd, it'd, we'd, and they'd. The contraction 'd can also stand for had, especially in perfect tenses, so context decides the meaning. In writing, use clear structure to avoid confusion.

Subject	Form
I	I'd
you	you'd
he	he'd
she	she'd
it	it'd
we	we'd
they	they'd

Not contracts with auxiliary verbs to form negative contractions like isn't, aren't, wasn't, weren't, hasn't, haven't, didn't, doesn't, and won't. The apostrophe replaces missing letters in not or in irregular forms. These negatives are basic to everyday communication.

Word/Phrase	Definition
isn't	Is not contracted with an apostrophe.
aren't	Are not contracted with an apostrophe.
wasn't	Was not contracted with an apostrophe.
weren't	Were not contracted with an apostrophe.
hasn't	Has not contracted with an apostrophe.
haven't	Have not contracted with an apostrophe.
didn't	Did not contracted with an apostrophe.
doesn't	Does not contracted with an apostrophe.
won't	Will not contracted as won't.

Some contractions do not follow a simple letter-by-letter pattern. Won't is the contraction of will not, and can't is the contraction of cannot. These forms are fixed and must be memorized as standard contractions.

Word/Phrase	Definition
won't	Will not contracted as won't.
can't	Cannot contracted as can't.
shan't	Shall not contracted as shan't.

Contractions are pronounced as single units with reduced vowels or linked sounds. In 'll and 'd, the contracted part is short and often blends with the previous word. In isn't and hasn't, the t is pronounced clearly at the end. Accurate pronunciation helps listeners recognize the contracted meaning.

Word	Notation	Description
I'm	/aɪm/	The two words are merged with a short m sound.
you're	/jɔr/	The r sound links the words and the vowel is reduced.
he'll	/hil/	The l is short and attaches to he as one unit.
I'd	/aɪd/	The d is brief and follows I without a pause.
isn't	/ˈɪzənt/	The t is pronounced and the vowel in the middle is reduced.

In writing, a contraction always uses an apostrophe in the correct place. Double contractions like wouldn't've exist in speech but are rare and informal in writing. Formal texts usually prefer full forms instead of contractions.

Rule
A contraction uses an apostrophe to mark missing letters.
Formal writing usually avoids contractions.
Double contractions are informal and rarely used in standard writing.