1、第1頁 Why is the road so wet?It must have rained last night.第2頁A: Where are the girls? Can they have gone home?B: No, they cant have gone home. Its so early.第3頁-Look, the lights are off in their room.-Where have they gone?-They might have gone to the cinema.第4頁A: Here is a doll for your daughter.B: Th

2、ank you so much. Its beautiful. But you neednt have bought it. She has so many at home.第5頁Finding the ruleModal verbs + have doneExplanationsExample sentencesmust have doneIt must have rained last night.Believing what happened in the past is the case (used only in positive sentences)第6頁can/could hav

3、e done -Where is John? Can he have gone to the playground?-No, he cant have gone to the playground. It is raining.indicating that something was a possibility in the past , though it did not actually happen (negative or interrogative sentences)第7頁may/might have doneThey might have mistaken you.Sugges

4、ting that it is possible that something happened or was true (used only in positive/ negative sentences)第8頁should/shouldnt have doneYou should have done your homework first.indicating that something did not / did happen, but the speaker wishes it had (not) happened.第9頁neednt have doneYou neednt have

5、 watered the plant. It rained last night.indicating that it is not necessary for sb. to do sth, though he / she did it.第10頁 must have done對過去非常必定推測（語氣最強(qiáng)）第11頁對已發(fā)生過去情況推測，若陳說句謂語部分有“must have done”，而且有表示過去時間狀語, 問句部分用didnt； 1) They must have gone there last night, didnt they? 第12頁2)They must have arrived

6、 by now, havent they?對已發(fā)生過去情況推測，若陳說句謂語部分有“must have done”，若沒有表示過去時間狀語，問句部分用havent 或hasnt .第13頁3) He must have been to the Great Wall,hasnt he? 對已發(fā)生過去情況推測，若陳說句謂語部分有“must have done”，若沒有表示過去時間狀語，問句部分用havent 或hasnt .第14頁這個房間昨天必定被清掃了。The room _ _ _ _ yesterday. must have been cleaned第15頁他一定已經(jīng)背了5000單詞了。He

7、 _ _ _ 5,000 words.must have learnt第16頁You must have seen the film “Journey to the West” , _ _? havent you第17頁They must have been to the World Expo last week, _ _? didnt they第18頁 can have done對過去疑問推測 cant have done對過去否定推測疑問句和否定句第19頁-Where is John? Can he have gone to the playground?-No, he cant have

8、 gone to the playground It is raining.第20頁- _Mr King _the letter?金先生已經(jīng)收到那封信了嗎？-No, he _it.不，他不可能收到。Canhave receivedcant have received第21頁may/might have done某事有可能發(fā)生過(表示對過去不太必定推測，語氣比must have done 弱)用于必定句和否定句(may語氣比might稍強(qiáng))第22頁-Where did Adam get that new football? He hasnt got any money. -It _ a pres

9、ent. After all, it was his birthday last week. A. might have been B. might be 第23頁He _out because the light was on.A. may not have gone B. may have not goneC. may not go D. must not have gone第24頁neednt have done本沒有必要做某事（但此事已做）第25頁We _the plant because it rained last night. (本無必要)neednt have watered第

10、26頁shouldnt have done本不該做某事（但此事已做）表示責(zé)備第27頁He should have repaired the bike yesterday.should have done本應(yīng)該做某事（但此事未做）表示責(zé)備 第28頁Oh, Imnotfeelingwellinthestomach. Ishouldnt have eaten so much fried chicken just now. 第29頁你本應(yīng)該先完成你作業(yè)。You _ _ _ your homework first. should have finished第30頁你本不應(yīng)該跟我撒謊。You _ _ _t

11、o me.shouldnt have lied第31頁高考例析 1. Sorry Im late. I _ have turned off the alarm clock and gone back to sleep again. （ 北京春季）A. might B. should C. can D. will 答案為 A。表推測用法。句意：對不起, 我遲到了。我(當(dāng)初)興許是關(guān)了鬧鐘又回去睡覺了。might 相當(dāng)于 may, 但語氣更加不愿定。第32頁2. I was really anxious about you. You_ home without a word. (01 全國)A.

12、mustnt leaveB. shouldnt have left C. couldnt have left D. neednt leave 答案為 B。虛擬語氣使用方法。句意：我（那時）真地很擔(dān)心你。你本不應(yīng)該不留個話就離開家。第33頁3. Ill tell Mary about her new job tomorrow. You_ her last week. （04 福建）A. ought to tell B. would have told C. must tell D. should have told答案為 D。虛擬語氣使用方法。句意：-我明天要告訴她我新工作情況。 -你本應(yīng)該上周

13、告訴她。第34頁4. Tom graduated from college at a very young age. Oh, he _ have been a very smart boy then. （04 全國IV） A. could B. should C. might D. must答案為 D。表推測使用方法。句意：湯姆很年輕時候就大學(xué)畢業(yè)了。哦，他必定是一個很聰明男孩兒。 第35頁5. He _ have completed his work; otherwise, he wouldnt be enjoying himself by the seaside. (05 北京卷) A.

14、should B. must C. wouldnt D. cant答案為 B。使用方法同4題。句意：他必定做完了工作，不然他就不會在海邊痛快地玩兒了。 第36頁6. Do you know where David is? I couldnt find him anywhere. Well. He _ have gone farhis coats still here. （05湖北卷） Ashouldnt Bmustnt Ccant Dwouldnt答案為 C。表推測使用方法。句意：你知道大衛(wèi)在哪兒嗎？我哪兒也找不到他。瞧，他不可能走遠(yuǎn)他上衣還在這兒呢。cant 相當(dāng)與 couldnt，但后者語

15、氣愈加委婉。 第37頁練習(xí) The woman biologist stayed in Africa studying wild animals for 13 years before she returned. Oh, dear! She _ a lot of difficulties! (05 江蘇卷) A. may go through B. might go throughC. ought to have gone through D. must have gone through第38頁2. I have lost one of my gloves. I _ it somewhere

16、. （05 北京春季）A. must drop B. must have dropped C. must be dropping D. must have been dropped 第39頁3. Mr. White _ at 8:30 for the meeting, but he didnt show up. （04 廣西） A. should have arrived B. should arriveC. should have had arrived D. should be arriving4. He paid for a seat, when he _ have entered free. （05 山東卷）A. could B. would C. must D. need第40頁5. Tom is never late for work. Why