请用can；may；must造句

can造句：

1.Jogging can be harmful to the health.

2.The story can’t be true.

3.Can I go now?

Yes, you can./No, you can't.

may造句：

1.She may be still waiting for us.

2.He may not come today.

3.May I go home now?

Yes, you may./No, you can't/mustn't.

must造句：

1.He must be at home.

2.You mustn't smoke here.

3.Must I clean the classroom now?

Yes, you must./No, you needn't.