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. 

I'm walking to the school tomorrow.

You are driving to work  the next week.

He's working the day after tomorrow.

She's washing the dishes the next weekend.

We are summing the next summer.

They are reading the next semester.

Maria is cooking a pay tomorrow.

Pedro is playing in his house the next saturday.

I'm running at nigth.

He's skating this winter.

he's playing

he;s smilling

he's kicking

he's having fun

he's exercising

he's not cooking

he isn't walking

he's not boxing

he isn't painting

he's not dancing

Present Continuous Tense

Action: is now
Aux. Verb: am, is, are
Verb: present participle (+ing)

Aff. structure
subject+ aux. verb+ verb (+ing)+ complement +.

Neg. structure
subject+ aux. verb+ not+ verb (ing)+ complement+.

Interrogative structure
if question
am, is, are+ subject+ verb (ing)+ complement+?


wh question
wh+ am, is, are+subject+ verb(ing)+ complement+?