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1、情態(tài)動詞+ have done動詞 + 動詞完成式即“情態(tài)動詞 + have + done”,表示對過去行為或動作進行推測、評論或判斷。這個結(jié)構(gòu)是近幾年高考情態(tài)動詞的重點和難點。一、在虛擬語氣中的用法1. should have done 表示“過去本應(yīng)該做某事卻未做?!逼浞穸ńY(jié)構(gòu)shouldn't have done 表示 “過去本不該做某事卻做了?!?. ought to have done 表示“過去本應(yīng)該做某事卻未做。 ”其否定結(jié)構(gòu) oughtn't to have done 表示 “過去本不該做某事卻做了?!?. need have done 表示“過去本有必要做某事
2、卻未做?!?其否定結(jié)構(gòu) needn't have done 表示“過去本沒必要做某事卻做了?!?. could ( 不能用can) have done 表示“過去本能夠做某事卻未做?!弊⒁猓浩浞穸ㄐ问絚ouldn'thave done 沒有虛擬語氣的用法,couldn't have done只能表推測,相當(dāng)于can't have done ,意為:“過去不可能做了某事。”5. might (不能用 may) have done 表示“過去本可以做某事卻未做?!弊⒁猓浩浞穸ㄐ问絤ight not have done 沒有虛擬語氣的用法, might not hav
3、e done 只能表推測, 相當(dāng)于 may not have done,意為:“過去可能沒有做某事?!倍⒈硗茰y的用法1. must have done表示對過去某事的肯定猜測,譯為:過去肯定做了某事。不存在mustn't have done 的形式。其否定或疑問形式須用can(could) 來表示 . 例如:Since the road is wet, it must have rained last night.既然路是濕的,那昨天晚上肯定下雨了。He can't have missed the way. I drew him a map.他不可能迷路。我(當(dāng)時)給他畫了張
4、圖。“The dictionary has disappeared. Who could have taken it? ” 詞典不見了,(過去)誰可能把它拿走了?2. may / might have donemay / might have done 表示“過去可能做了某事”。 may 比 might 表示的可能性在說話人看來稍大些。 may/might not have done 表示“過去可能沒有做某事?!崩纾篒 can't find my keys. I may / might have left them at the school yesterday.我找不到我的鑰匙了。
5、精選文庫我可能昨天把他們落在學(xué)校了。John may/might not have passed the exam; he looks very sad. 約翰可能沒有通過考試。 他看起來很憂傷。注意: may/might have done 表推測不能用于疑問句中。3. can/could have done 表推測一般用在否定句和疑問句中,表示不相信或懷疑的態(tài)度。Can/Could he have passed the exam?他可能通過了考試嗎?I think that he couldn t/can't have gone abroad. I saw him just now
6、. 我認為他不可能出國了。我剛才還看見他了。注:表示推測過去某動作發(fā)生的可能性時,就表示的可能性程度而言,must 最大, could 其次, may 更次之, might 最小。例如:“I wonder how Tom knew about your past. ” “我想知道湯姆是怎么知道你的過去的?!薄癏e must / could / may / might have heard of it from Mary. ” “他肯定 /很可能 /可能 /興許(沒準兒)已從瑪麗那兒聽說此事了?!比⒏呖祭?. Sorry I'm late. I _ have turned off t
7、he alarm clock and gone back to sleep again.(2000北京春季)A. mightB. shouldC. canD. will答案為 A 。表推測的用法。句意:對不起,我遲到了。我(當(dāng)時)興許是關(guān)了鬧鐘又回去睡覺了。 might 相當(dāng)于 may, 但語氣更加不肯定。2. I was really anxious about you. You_ home without a word.( 01 全國)A. mustn't leave B. shouldn't have left C. couldn't have left D. n
8、eedn't leave答案為 B 。虛擬語氣用法。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。3. I ll 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-2精選文庫答案為D。虛擬語氣用法。句意:-我明天要告訴她我的新工作的情況。- 你本應(yīng)該上周告訴她。4. Tom graduated from college at a very young age. Oh,
9、 he _ have been a very smart boy then. ( 04 全國 IV )A. could B. should C. might D. must答案為 D 。表推測的用法。句意:湯姆很年輕的時候就大學(xué)畢業(yè)了。哦,他肯定是一個很聰明的男孩兒。5. He _ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside. (05 北京卷 )A. should B. must C. wouldn't D. can't答案為B。用法同4 題。句意:
10、他肯定做完了工作,不然他就不會在海邊痛快地玩兒了。6. Do you know where David is? I couldn't find him anywhere. Well. He have gone far his coat's still here. ( 05 湖北卷)A shouldn't B mustn't C can't D wouldn't答案為C。表推測的用法。句意:你知道大衛(wèi)在哪兒嗎?我哪兒也找不到他。瞧,他不可能走遠他的上衣還在這兒呢。can't 相當(dāng)與couldn't ,但后者語氣更加委婉。四、練習(xí)1.
11、 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 through2. I have lost one of my gloves. I _ it somewhere. ( 05 北京春季)A. mus
12、t drop B. must have dropped-3精選文庫C. must be dropping D. must have been dropped3. Mr. White _ at 8:30 for the meeting, but he didn't 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. need5. Tom is never late for work. Why is he absent today? Something _ to him. (05江西卷 )A must happen B should have happenedC could have happened D must have happened6.I _ have been more than six years old when the accident happened. ( 05天津卷
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