Unit 6 Space and beyond Using language（ppt课件）-新外研版（2019）《高中英语》选择性必修第四册.pptx

1、should1 应该应该（表示义务、责任、劝告、建议等（表示义务、责任、劝告、建议等）The young should respect the old.(义务，责任义务，责任)2 should(not)/ought(not)to have done 本来本来(不不)应该（表示对过应该（表示对过去行为的责备或后悔）去行为的责备或后悔）You should have told me the news earlier,but you didnt.(责备责备)3 大概大概，估计会，按理应该，估计会，按理应该（表示推测，可能性较大）（表示推测，可能性较大）The new dictionary shoul

2、d be out next month.(推测）推测）Its already 7.He should be here at any moment.(推测推测)should4 should还可以表示还可以表示“万一，竟然，应该，倒是万一，竟然，应该，倒是”等意思，用于等意思，用于虚拟语气虚拟语气或表示委婉。或表示委婉。If I should fail to come back as planned,you must leave at once.Its surprising that he should be so rude in public.should和ought to均表示“应该、应当应该

3、、应当”，should多表主观主观看法，ought to 则多反映客观客观情况；否定为ought not to即学即用即学即用31.should2.shall3.shouldnt have leftwill1 助动词助动词,表示表示“将，将要将，将要”，用于将来时；，用于将来时；would表示表示过去将过去将来。来。2 情态动词情态动词,表示表示“愿意，决心；总是，老是（习惯性愿意，决心；总是，老是（习惯性动作动作）”；would表示过去的意愿或习惯。表示过去的意愿或习惯。You are my friend.I will do my best to help you.(意愿意愿)Trust m

4、e.I wont disappoint you.(决心）决心）Every year he will go to Hainan for his winter vacation.(习惯习惯)Whenever I was in trouble,he would be the first to offer help.will/would1)If you _ see the movie,I will prepare a ticket for you.A.B.will C.need D.shall2)If you _ see the film,you will find it worth the time

5、 and money.注：注：would表示过去的行为习惯时，表示过去的行为习惯时，与现在无关与现在无关；used to do表示过去表示过去常常，常常，言下之意是现在不再如此言下之意是现在不再如此。Working as a taxi driver,he doesnt drink much as he _.BAused to即学即用即学即用41.would give me a lift2.what it was/used to be3.used to thinkmust/have to must 表示“必须、一定要”，强调主观主观意愿，其否定形式；mustnt表示“禁止、一定不能”；have

6、to 多表示客观客观上的“必须、不得不”；Must I return the book on time?Yes,you _.No,you _.neednt/dont have to/dont need tomust即学即用即学即用51.must go2.must be doing their jobs3.cannot have gone far情态动词表推测情态动词表推测 might may could can should muste.g.The phone has broken down,so Tom cannot be making a phone call now.dobe doing

7、have done会做正在做已经做注：在肯定句中，can可表客观存在的可能性，理解为“有时会，有时会，时而可能时而可能”Its usually warm in my hometown,but it can be very cold sometimes.情态动词情态动词have done 表示对过去情况的推测、责备、假设和虚表示对过去情况的推测、责备、假设和虚拟等。拟等。1)must have done:“一定做过一定做过”对过去发生事情的肯定推测对过去发生事情的肯定推测He must have done something bad,or he would not have been taken

8、 to the police station.The boy cant/couldnt have finished reading the book so soon because it is difficult even to an adult.She has been absent for 2 days.Where can/could she have gone?2)may/might have done:“可能已经可能已经”推测过去的行为推测过去的行为（肯，否）（肯，否）She may/might have said so.She havent come yet.She may not

9、have received the message.情态动词情态动词have done 表示对过去情况的推测、责备、假设和虚表示对过去情况的推测、责备、假设和虚拟等。拟等。3)should/shouldnt have done:该做而没做该做而没做/做了不该做的做了不该做的You shouldnt have run across the busy street.You might have been hit by a car.You ought to have refused her at the beginning,but now its too late.4)neednt have don

10、e:做了没必要做的事做了没必要做的事Our flight has been put off.We neednt have taken a taxi.情态动词情态动词have done 表推测：表推测：1)一定做了一定做了 不可能做过不可能做过2)可能做过可能做过3)或许做过或许做过 或许没有做过或许没有做过表表虚拟：虚拟：1)本不必却做了本不必却做了 2)本应该却没有本应该却没有 本不应该却做了本不应该却做了3)本可以却没有本可以却没有 must have donecant/couldnt have donecan/could have donemay/might have donemay/m

11、ight not have donedare(敢敢)/need(需要需要)1)在在肯定句肯定句中只能用作中只能用作行为动词行为动词，后跟，后跟to do，to不能省略。不能省略。2)在在疑问句、否定句和条件状语从句疑问句、否定句和条件状语从句中兼作中兼作行为动词行为动词和和情态动情态动词词。You need to hurry.Time is limited.I neednt hurry/dont need(have)to hurry.There is plenty of time.3)I dare say 我我敢说（固定说法，相当于敢说（固定说法，相当于no doubt/Im sure)dar

12、e/need1.A courageous man,he _ accept any challenge.A.dare to B.dares to C.dared D.dare 2.The thriller movie is so horrible that I _ see it again.A.dont dare to B.dare not to C.dares not D.doesnt dare to B A即学即用即学即用61.He dares to cross the river.2.He dare not cross the river.He doesnt dare to cross t

13、he river.neednt have done didnt need to do 本不必做 没必要做，也没做 We _(wait)for him.It was really a waste of time.I _(read)the book,because I had already known about it.My room is in a mess,but I _(不必)clean it tonight.I can do it tomorrow morning.neednt have waited didnt need to read dont need to/needntSubju

14、nctive moodIf条件句的虚拟条件句的虚拟时间时间if条件句条件句主句主句与现在事实相反与过去事实相反与将来事实相反did/werewould/should/could/might dohad donewould/should/could/might have donedid/wereshould dowere to dowould/should/could/might do1.如果我是鸟，我就能飞。2.如果不是亲眼所见，我不会相信这故事。If I hadnt seen it,I wouldnt have believed this story.3.如果明天下雨，运动会就会延期。If

15、it rained/should rain/were to rain tomorrow,the sports meeting would be put off.If I were a bird,I would fly.Were I a bird,I would fly.Should it rain tomorrow,.Were it to rain tomorrow,.错综时间条件句错综时间条件句 一般情况，if条件句与主句在时间上呈对应关系，但有时会出现二者不一致的情况。If you had listened to me yesterday,you wouldnt be in trouble

16、 now.与过去事实相反与过去事实相反与现在事实相反与现在事实相反含蓄虚拟语气含蓄虚拟语气 without,but for,otherwise,or表假设，主句时态与if主句相同。1.The workers were not better organized;otherwise they _(accomplish)the task in half the time.2.But for/Without the help of the police,it _(be)possible for me to find my daughter.Thank goodness weve found her.3.Its lucky we booked a room,or we _(have)nowhere to stay now.would have accomplishedwould not have beenwould haveNov.23词汇书 Day33、Day34综合练习；报纸 每日一练+Page 4Nov.24B7U6 Developing ideas