Present continuous!

Present continuous is formed with: am/is/are + present participle.

Ex:
He is doing homework.
Is he doing homework?
He is not doing homework.

We use present continuous when somehting is doing at the moment and to say what is not doing at the moment.

Ex:
You are learning English now.
You are not swimming now.
Are you sleeping?
I am sitting.
I am not standing.
Is he sitting or standing?
They are reading their books.
They are not watching television.
What are you doing?
Why aren't you doing your homework?

Credits: Wikilearning