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?