中考英语知识点：情态动词的否定用法

　　(　D　)1.—Can we walk across the road now?

　　—No，we ________.We have to wait until the light turns green.

　　A．couldn't   B．needn't

　　C．shouldn't  D．mustn't

　　(　B　)2.Students ________ be allowed to get their ears pierced.

　　A．needn't  B．shouldn't

　　C．can   D．may

　　(　A　)3.—Must I return the books today?

　　—No，you________.You can keep them for three days.

　　A．needn't  B．can't

　　C．mustn't  D．shouldn't