In everyday spoken English forms of the verb 'to be' and other auxiliary verbs are usually contracted:
Example: He's been to London, They aren't our neighbors
Here is a chart of when to use the most common contractions in English.
|Auxiliary Form||Contractions With Pronouns||Contractions With Nouns||Contractions With Question Words|
|am||I'm working this morning.||-||What'm I supposed to say? (common only in spoken English)|
|is||He's going to come. - She's a teacher. - It's easy!||John's at work. - Mary's playing the piano at the moment.||Who's on the telephone? - What's he doing?|
|are||You're a great friend! - They're playing golf this afternoon.||The books're on their way. (common only in spoken English)||What're you going to do?|
|has||He's been to Paris twice. - It's been such a long time! - She's lived there all her life.||Mary's gone to the store.||What's she been doing? - Who's been invited?|
|have||I've finished my homework. - They've got two cars.||The students've finished their homework. (common only in spoken English)||Where've you been all day? (common only in spoken English)|
|had||He'd been waiting for three hours. - We'd better be going.||Jack'd worked there before he left. (common only in spoken English)||What'd you done before that? (common only in spoken English)|
|will||I'll get you something to eat. - We'll be there soon.||Peter'll catch the bus to work.||What'll we do? Where'll you take us?|
|would||I'd like some fish. They'd love to ask you some questions.||Jane'd love to come.||Where'd you like to go? (common only in spoken English)|
Rule: Do not use the contracted form of the auxiliary in formal writing
Example: Dear Mr Brown,
I would like to invite you to our company presentation ...
NOT!!: Dear Mr Brown,
I'd like to invite you to our company presentation ...
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