What is he doing?
He is skipping
What is she doing?
She is shouting.
What are they doing?
They are using a mobile phone.
We ________ do our homework.
must
What are they doing?
They are laughing.
What is he doing?
He is crying.
We _______ shout in class.
mustn't
What is he doing?
He is throwing a ball.
What is she doing?
She is hopping.