Grammar Reference

Verbs

Past of to be

Present		Past
Affirmative	Negative	Affirmative	Negative
I am	I'm not	I was	I wasn't
you are	you aren't	you were	you weren't
she/he/it is	she/he/it isn't	she/he/it was	she/he/it wasn't
we/you/they are	we/you/they aren't	we/you/they were	we/you/they weren't

Note: We can contract the negative sentences in two different ways.

You aren't Australian. = You're not Australian.
She isn't American. = She's not American.

But it is not possible to contract am.

I'm not Japanese.
NOT: I amn't Japanese.