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