VERBO TO BE EN INGLES / PRESENT SIMPLE.

VERB BE (ser ó estar). PRESENT SIMPLE.

Positive
I'm
you're
he's
she's     American/very old/happy.
it´s
we're
you're
they're

Negative
I'm not
you arent'
he isn't
she isn't   Portuguese/very young/sad.
it isn't
we aren't
you aren't
they aren't

Interrogative
Am I        American?
Are you    Portuguese?
Is he        German?
Is she       French?
Is it          Chinese?
Are we    Canadian?
Are you   Mexican?
Are they  Italian?

Short Answer
Yes, I am./No, I'm not.
Yes, you are. /No, You aren't.
Yes he is./ No, he isn't.
Yes, she is./ No, she isn't.
Yes, it is/No, it isn't.
Yes, we are./No, we aren't.
Yes, you are./No, they aren't.
Yes, they are./No, they aren't.