U7Grammar含有情态动词的被动语态.

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一.情态动词的含义和用法

1．表示推测及可能性

e.g.Hemustberich.

Thiscantbedonebyhim.

Hemay/mightbeverybusynow.

2．表示请求和允许

e.g.CanIgonow?

Might/MayIsmokeinthisroom?

3．表示命令、建议和劝告

e.g.Youshould/oughttodoyourhomeworkafterschool.

Youcouldwearmyshoesifyouwant

4．表示