What can't he do?
He can't ride a bike.
What can Mary do?
She can play the piano.
Can elephants fly?
No, they can't.
You __________ wear a helmet when riding a motorbike. (can, should or must)
must
What musn't Tom do?
Tom musn't sleep in class.
We __________ eat fruit and vegetables. They are healthy foods. (should or shouldn't)
should
What must he do?
He must do his homework.
I _________ run very fast. I'm the fastest girl in the class. (can, should or must)
can
It's hot. You _________ open the window. (can, should or must)
should
Should he watch TV all day?
No, he shouldn't.
What should he do in the morning?
He should get up early.
You ________ go to class late. Teacher will be angry! (must or mustn't)
musn't
You __________ play with fire. (should or shouldn't)
shouldn't
You _________ keep quiet in the library. (must or mustn't)
must
Jill _________ drive. She's a taxi driver. (can or can't)
can
You _________ throw rubbish around. (must or mustn't)
mustn't
It's cold. You __________ put on a coat and a scarf. (should or shouldn't)
should
John ________ swim. He hates water. (can or can't)
can't