1. FORM OF PRESENT CONTINUOUS
to be (am/is/are) + infinitive + -ing
She is cooking dinner.
Is she cooking dinner?
She is not cooking dinner
2. USE OF PRESENT CONTINUOUS
We use present continuous tense when we talk about an action that happening now (we are in the middle of this activity).
We also use this tense when we want to make clear that the action is temporary.
I am reading. / I am writing.
In these examples we are talking about activities that are still not yet finished or complete at the time of speaking.
USE 1 - something is happening now
at the moment of speaking
The TV in my room isn' working.
Are you going home?
USE 2 - longer actions
longer but temporary
We are studying English grammar.
I am not doing any sport at this time of year.
Are you still working for the same company?
USE 3 - fixed plan in the future
something will or will not happen in specified time in the future.
I'meeting him at 10.00.
We aren't going to Italy this summer.
Is he coming tonight?
I am reading newspapers.
They're not watching TV.
Mary is not studying to become a doctor.
Why don't you making your homework?
Is he visiting his sister next week?
My dad always coming to work late.
Most of verbs is possible to use in present continuous form: to do, to have, to go, to make, ...
But some verbs is not possible to use in present continuous form: to want, to cost, to need, to like, ...