AM/IS/ARE

TO BE [IS / AM / ARE]

My name is Lisa.
I'm 22.
I'm American. I'm from Chicago.
My father is a doctor and my mother is a journalist.
I'm not married.
My favorite colour is blue.
My favorite sports are football and swimming.
I'm interested in art. 

POSITIVE 
I=> am => I'm
She, he, it, => is => She's, he's, it's, 
We, you, they=> are= > we're, you're,they're.

NEGATIVE
I am not [I'm not]
He,she,it [is not] => he's not,she's not, it's not
we,you,they [are not]=> we're not, you're not, they're not

or
he isn't
she isn't
it isn't

we aren't 
you aren't
they aren't

=> I'm cold. Can you close the window, please?
=> I'm 32 years old. My sister is 29.
=> My brother is very tall. He's a policeman.
=> John is afraid of dogs.
=> It's ten o'clock. You're late again.
=> Ann and I are good friends.
=> Your keys are on the table.

=> I'm tired but I'm not hungry.
=> Tom isn't interested in politics. He's interested in music.
=> Jane isn't at home at the moment. She's at work.
=> Those people aren't English. They're Australian.
=>It's sunny today but it isn't warm.

That's = that is
there's = there is 
here's = here is

=> Thank you. That's very kind of you.
=> Look! There's Chris.
=> "Here's your key." "Thank you."

EXERCISES
1.1 Write short form [she's/ we aren't etc.].
1. She is ____she's_______
2. They are _____________
3. It is not _____________
4. That is ______________
5. I am not _____________
6. You are not ____________

to be continued
Reference:
Essential Grammar In Use [Second Edition]


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