含情态动词的被动语态课件.ppt

关于含情态动词的被动语态
第一页，本课件共有17页
含情态动词的被动语态
常用的情态动词有：
can, could (能；会), may; might (可以) must(必须), should(应该), would(愿意)
have to(必须；不得不), had better(最好做)
第二页，本课件共有17页
主动句变被动句的步骤与其它情况相同。
1. We should allow teenagers to watch TV on Sunday.
Teenagers should be allowed to watch TV on Sunday( by us) .
2. My mother can cook delicious meals.
Delicious meals can be cooked ( by my mother ).
第三页，本课件共有17页
3. People may catch fish in the river.
Fish may be caught in the river (by people).
must keep teenagers away from the Internet?
Teenagers must be kept away from the Internet.
第四页，本课件共有17页
can/could
must
should
may/might
had better
have to
情态动词+be +过去分词
be done
结构
第五页，本课件共有17页
flowers ___often.
A. must be water B. must be watered
C. must watered D. must water
2. The books may___ for two weeks.
A. be kept B. be borrowed
C. keep D. borrow
3 The broken bike____ here by Mr Smith.
A. can mend B. can mended
C. can be mend D. can be mended
trees should ________ every year.
A. be planted B. planted
C. plant D. are planted
第六页，本课件共有17页
homework should be finished first.
Your homework shouldn't be finished first.
Should your homework be finished first ?
2. This magazine can be taken home.
This magazine can't be taken home.
Can this magazine be taken home ?
第七页，本课件共有17页
3. Trees must be watered every day.
Trees mustn't be watered every day.
Must trees be watered every day?
第八页，本课件共有17页
情态动词+not + be + 过去分词
can/could
must
should
may/might
had better
not be done
否定式
第九页，本课件共有17页
情态动词+ 主语+ be + 过去分词
Can/Could
Must
Should
May
+ 主语 be done ？
一般疑问式
第十页，本课件共有17页