Is he watching TV? (+)
Yes, he is.
Is he surfing the internet? (-)
No, he isn´t.
What are they doing?
They´re dancing.
Is he listening to music? (+)
Yes, he is.
Is he walking the dog? (-)
No, he isn´t.
Are they cooking breakfast? (-)
No, they aren´t.
Is she playing computer games? (+)
Yes, she is.
Are they chatting to friends online? (+)
Yes, they are.
Are they surfing the internet? (+)
Yes, they are.
Are they playing tennis? (+)
Yes, they are.
Is it swimming? (+)
Yes, it is.
Is he swimming? (-)
No, he isn´t.
Is it riding a bike? (+)
Yes, it is.
What is she doing?
She´s eating pizza.
What is he doing?
He´s playing computer games.