DariaArshakuni Swim + ing = swimming   play + ing = playing
sleep + ing = sleeping     have + ing =having
cry + ing = crying            work + ing = working  fly + ing = flying

You are not making a sandcastle.  Are you making a sandcastle?
We are  not going on a picnic. Are we going on a picnic?
It is not rainig today. Is it raining today?

Tom and Kate are dancing now. 
John is playing the guitar now.
What are you doing?
Where is Liz having her holidays? - In Italy.

We ARE looking through the holiday photo album.
The children ARE NOT playing football right now.
IS she watching TV now?