情态动词及情态动词的被动语态课件.ppt

1、含情态动词的被动语态含情态动词的被动语态情态动词有哪些情态动词有哪些?1.can/may/must/will/shall/should/ought to2.need/dare3.had better/would rather,used to/have to/be able to2情态动词的含义情态动词的含义序号序号12原形原形canmay过去式过去式couldmight主要含义主要含义1.能力能力2.请求请求/准许准许3.可能性可能性1.请求请求/准许准许2.可能性可能性*3.祝愿祝愿1.义务义务(必须必须);2.猜测猜测(肯定肯定)34567mustneeddarewillshallmust

2、had toneededdaredwouldshould需要需要敢敢愿意愿意1.征求意见征求意见2“应该应该”(should)3情态动词的含义情态动词的含义序号序号8910111213原形原形be able tohave toought toused tohad betterwould rather过去式过去式was/were able tohad toought to主要用法主要用法“能够能够”（能力）（能力）“不得不不得不/必须必须”“应该应该”“过去（常常）过去（常常）”“最好最好”“宁愿宁愿”4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+PPcan/could

3、be donemust be doneshould be donemay/might be donehad better be donehave to be done否定式：情态动词否定式：情态动词+not+be+p.pcan/could not be donemust not be doneshould not be donemay/might not be donehad better not be donehave not to be done疑问式：情态动词疑问式：情态动词+主语主语+be+p.pcan/could+主语主语+be donemust+主语主语+be doneshould

4、+主语主语+be donemay/might+主语主语+be donehad+主语主语+better be donehave+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 more trees.Many more trees should be planted by us.Should many more trees be planted by us?3.Parents should allo

5、w teenagers to drive the car.Teenagers should be allowed by parents to drive the car.Should teenagers be allowed by parents to drive the car?4.You can pass the exam if you study hard.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)They must

6、water trees every day.Trees must be watered by them 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).1.My mother can cook delicious meals.Delicious meals can be cooked by my mother.2.Students will use these textbooks next

7、 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.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)S

8、ixteen-year-olds shouldnt be allowed to drive.Should sixteen-year-olds be allowed to drive?Yes they should./No,they shouldnt.4.I think the work should be done at once.(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 thes

9、e 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.