Contracted form

 Present Continuous (Positive)          Present Continuous (Negative)

I am= I’m                                                        I am not= I’m not

We are= We’re                                               We are not= We’re not/ We aren’t

You are= You’re                                             You are not= You’re not/ You aren’t

He is= He’s                                                     He is not=He’s not/  He isn’t

She is = She’s

It is = It’s

They are= They’re

Present Perfect

I have= I’ve

We have= We’ve

You have= you’ve

He has= He’s

She is = She’s

It is = It’s

They are= They’re

Past Tense

No contracted form is of was & were.