高中英语语法 情态动词用法总结（20张PPT）.ppt

1、GrammarModal verbs 情态动词主要情态动词 Can,could May,might Must/have to Need Dare Will/would Shall/should/ought to What modal verbs have you learned?情态动词的语法特征1）情态动词 不能单独做谓语，除ought外，后面只能接不带to 的不定式。2）情态动词没有人称，数的变化，但有些情态动词，如can、will也有一般式和过去式的变化。3）情态动词的“时态”形式并不是时间区别的主要标志，不少情况下，情态动词的现在式形式和过去式形式都可用来表示现在时间、过去时间和将来时

2、间。1)Some of us can use the computer now,but we couldnt last year.2)The new-built theatre can seat 1500 people.3)Can she be in the computer center?4)I think what he said can not be true.5)Can/Could I use your dictionary?6)Could you lend me a hand?1.表能力3.表示“请求”“允许”(表请求时，口语中常用 could 代替 can 使语气更委婉，回答时用c

3、an)2.表示推测，意为“可能”“或许”，用于疑问句或否定句1.can 与could4.表示“许可”，可与may 换用。You can go home now.5.can 用于疑问句或否定句中时，表惊异、不相信等，意思是“可能、能够”。How can you say that you really understand the wholestory if you have covered only part of the article?6.cant/couldnt+have+done 表示对过去情况的否定推测Susan cant have written a report like this

4、.could+have+done 表示对过去能做而未做的事情感到惋惜，遗憾;常译为本可以Its a pity.Your class could have got the first prize.1.Michael _ be a policeman,for hes much too short.A.neednt B.cant C.should D.may2.Mr.Bush is on time for everything.How _ it be that he was late for the opening ceremony?A.can B.should C.may D.must3.-I s

5、tayed at a hotel while in New York.-Oh,did you?You _ with Barbara.A.could have stayed B.could stay C.would stay D.must have stayed4.My sister met him at the Grand Theater yesterday afternoon,so he _ your lecture.A.couldnt have attended B.neednt have attended C.mustnt have attended D.shouldnt have at

6、tendedBAAA2.may 与might1.表示“许可”或“请求”，有“可以”的意思，口语中常用 might 代 may,表示委婉语气。否定回答时用“must not/can not”表“禁止，阻止”，不用“may not”.“may not”表示“可能不”。Eg:1)-May I watch TV after supper?-Yes,you may./No,you mustnt.2)Today is Sunday.She may not be in her office now.2.表示可能性。意为“或许，可能”might 比 may 可能性小。Eg:1)It might be true

7、.2)They may be in the library now.3.May you+动词原形 表“希望、祝愿、祈求”“祝你”Eg:May you success.1.Sorry Im late.I _ have turned off the alarm clock and gone back to sleep again.A.might B.shouldC.can D.will2.Peter _ come with us tonight,but he isnt very sure yet.A.must B.may C.can D.will3.Some people who dont lik

8、e to talk much are not necessarily shy；they just be quiet people.A.must B.mayC.should D.would3.will 与would 1.表“请求、建议”等，用 would 比用will 委婉，客气些Eg:1)Will you lend me your book?2)Would you like a cup of tea?2.用于表示意志或意愿。will 指现在，而 would 指 过去。Eg:1)Ill never do that again.2)They said that they would help us

9、.3)No matter what I said,he wont listen to me.3.表示习惯性动作。译作“总是、惯于”will 指现在，would 指过去。Eg:1)He will often read all night.2)Fish will die without water.3)Every evening,she would sit by window,deep in thought.4.表示功能，译作“能、行”Eg:1)That will be all right.2)This door wont open.1.The way the guests _ in the ho

10、tel influenced their evaluation of the service A.treated B.were treated C.would treat D.would be treatedWhat a pity.Considering his ability and experience,he _ better.A.need have done B.must have doneC.can have done D.might have done Liza _ well not want to go on the trip-she hates traveling.A.will

11、B.can C.must D.mayAlthough this _ sound like a simple task,great care is needed.A.must B.may C.shall D.should DDBD4.should1.用于表劝告、建议。意为”应该、应当”。Eg:You should keep your promise.2.用于表推测。意为“可能、该”Eg:1)Its 7 oclock,he should be at home.2)They should have arrived by now.3.用于第一人称，表示说话人的谦逊、客气的语气I should advi

12、se you not to do that.1.I dont care what people think.Well,you _A.could B.would C.should D.might2.What do you mean,there are only ten tickets?There_be twelve.A.should B.would C.will D.shallCA5.must1.表示义务或强烈的劝告，意为“必须”“应该”，其否定式表示“不应该”“不许可”“不准”“禁止”。Eg:1)You must finish your homework first.2)Children mu

13、stnt speak like that to their parents.2.回答 must 所在的一般疑问句时，否定回答用 “neednt”“dont have to”.Eg:-Must we finish the work tomorrow?-No,you neednt/dont have to,but you must finish it in three days.3.表推测，用于肯定句，意为“一定”“务必”。Eg:1)Betty must be in the next room.2)He must be watering the flowers in his garden.Comp

14、lete the following sentences using modal verbs.1.Youve been working all day.You _ be very tired.2.I wonder who that is.It _ be Lisa.Shes in the library at this time.3.It is a long time since we met last time.You _ come and see us more often.4.I havent decided where Im going for my holidays.I _ go to

15、 Australia.mustcantshouldmay5.-Who was the man talking with your teacher?-Im not sure.It _ be her brother.6.I dont know when the guests be here.They _ arrive at any time.mightwill/could1.As he had heart attack,he was told that he _ continue the work.A.neednt B.may not C.mustnt D.cant2.I _ like to ma

16、ke a suggestion.A.could B.would C.must D.might3.I know things are hard with you,but you _ try to get over the difficulties.A.can B.may C.must D.oughtCCBChoose the best answers.4.We hope that as many people as possible _ join us for the picnic tomorrow.A.may B.must C.should D.can5.I think Ill give Bo

17、b a ring.You _.You havent been in touch with him for ages.A.will B.may C.would D.shouldDD6.It is usually warm in my hometown in March,but it _ be rather cold sometimes.A.must B.can C.should D.would7.You dont have to know the name of the author to find a book.You _ find the book by the title.A.must B

18、.need C.can D.would 8.Although this _ sound like a simple task,great care is needed.A.must B.may C.shall D.shouldBCB9.You _ be hungry already you had lunch only two hours ago!A.wouldnt B.cant C.mustnt D.neednt10.According to the air traffic rules,you _ switch off your mobile phone before boarding.A.may B.can C.would D.should11.She _ have left school,for her bike is still here.A.cant B.wouldnt C.shouldnt D.mustntBDA