含情态动词的被动语态 图文.ppt

语法学习
含情态动词的被动语态
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)
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 ).
3. People may catch fish in the river.
Fish may be caught in the river (by people).
must keep teenagers away from the ?
Teenagers must be kept away from the .
can/could
must
should
may/might
had better
have to
情态动词+be +过去分词
be done
结构
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
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 ?
3. Trees must be watered every day.
Trees mustn't be watered every day.
Must trees be watered every day?
情态动词+not + be + 过去分词
can/could
must
should
may/might
had better
not be done
否定式
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