3.Is he writing?
No,he isn't.
He is reading.
4.Is she playing the piano?
No,she isn't.
She is playing the computer
5.Is he skiing?
No,he isn't.
He is swimming.
6.Are they dancing?
Yes,they are.
They are dancing,
7.Is it jumping?
No,it isn't.
It is flying.
8.Is he watching TV?
No,he isn't.
He is listening to the radio.