Simple Present  verb "Be"
I am
You are
He is
She is
It is 
We are
You are
They are

Contractions
I´m
You´re
He´s
She´s
It´s
We´re
You´re
They´re

Negative (-)
I´m not
You aren´t
He isn´t
She isn´t
It isn´t
We aren´t
You aren´t
They aren´t

Interrogative 
Am I...?
Are you...?
Is he...?
Is she...?
Is it...?
Are we...?
Are you...?
Are they...?

Simple Past ver "Be"
I was
You were
He was
She was
It was
We were
You were
They were

Negative
I wasn´t
You weren´t
He wasnt
She wasn´t
It wasn´t
We weren´t
You weren´t
They weren´t

Interrogative
Was I...?
Were you...?
Was he...?
Was she...?
Was it...?
Were we...?
Were you...?
Were they...?


Examples:


He was as professor.
I was thin.
They were in the museum.