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1、含情态动词的被动语态含情态动词的被动语态 can/could be done must be done should be done may/might be done had better be done have to be done含情态动词的被动语态：含情态动词的被动语态： 情态动词情态动词+be +PP否定式：情态动词否定式：情态动词+not + be + p.p can/could not be done must not be done should not be done may/might not be done had better not be done have not
2、 to be done疑问式：情态动词疑问式：情态动词+ 主语主语+ be + p.p can/could +主语主语 +be done must +主语主语 + be done should +主语主语 + be done may/might +主语主语 + be done had +主语主语 + better be done have +主语主语 + to be done1.I can finish the work. The work can be finished by me. Can the work be finished by you?2.We should plant many
3、 more trees. Many more trees should be planted by us. Should many more trees be planted by us?Teenagers should be allowed by parents to drive the car .3.Parents should allow teenagers to drive the car.Should teenagers be allowed by parents to drive the car ?4.You can pass the exam if you study hard.
4、The exam can be passed (by you) if you study hard.Can the exam be passed (by you) if you study hard?water(浇水浇水)Trees must be watered by them every day.They must water trees every day.Must trees be watered by them every day?People may catch fish in the river.Fish may be caught in the river (by people
5、).1.My mother can cook delicious meals. Delicious meals can be cooked by my mother.2. Students will use these textbooks next term.These textbooks will be used next term by students .3. You should water trees often . Trees should be watered by you often .4.You must not plant trees in very dry earth .
6、Trees must not be planted by you in very dry earth. 3. Sixteen-year-olds should be allowed to drive.(先改为否定句，再改一般疑问句先改为否定句，再改一般疑问句) Should sixteen-year-olds be allowed to drive?Sixteen-year-olds shouldnt be allowed to drive.Yes they should./ No, they shouldnt.4. I think the work should be done at onc
7、e.(改为否定句改为否定句)I dont think the work should be done at once.Drills:1.We should look after elder people very well.2.We should answer these questions as soon as possible.3.We must clean our classroom this afternoon.4.You must hand in your homework before nine oclock.5.You can bring your friends to my birthday party tomorrow evening.6.You shouldnt touch the things on display in the museum.7.They may grow fruit trees around village next spring.
