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2019-2020年高考英語一輪復習 第22講 情態(tài)動詞與虛擬語氣經(jīng)典精講練習（上） 開篇語 開心自測 開心自測講解 題一： Maybe if I _______ science, and not literature then, I would be able to give you more help. A. studied B. would study C. had studied D. was studying 題二： I ______ sooner but I didn’t know that they were waiting for me. A. had e B. was ing C. would e D. would have e 題三： We _____ John’s name on the race list yesterday but for his recent injury. A. will put B. will have put C. would put D. would have put 題四： —Pity you missed the lecture on nuclear pollution. —I____ it, but I was busy preparing for a job interview. A. attended B. had attended C. would attend D. would have attended 主要考點梳理 情態(tài)動詞 情態(tài)動詞的語法特征 1） 情態(tài)動詞不能表示正在發(fā)生或已經(jīng)發(fā)生的事情，只表示期待或估計某事的發(fā)生； 2） 情態(tài)動詞 除ought 和have 外，后面只能接不帶to 的不定式； 3） 情態(tài)動詞沒有人稱，數(shù)的變化，即情態(tài)動詞第三人稱單數(shù)不加-s； 4） 情態(tài)動詞沒有非謂語形式，即沒有不定式、分詞等形式。 比較can 和be able to can和could 表示能力；可能 (過去時用could), 只用于現(xiàn)在式和過去式(could)。be able to可以用于各種時態(tài)。 They will be able to tell you the news soon. 他很快就能告訴你消息了。 只用be able to a. 位于助動詞后。 b. 情態(tài)動詞后。 c. 表示過去某時刻動作。 d. 用于句首表示條件。 e. 表示成功地做了某事時，只能用was/were able to，不能用could。 He was able to flee Europe before the war broke out. = He managed to flee Europe before the war broke out. 注意：could不表示時態(tài)。 提出委婉的請求，（注意在回答中不可用could）。 　　—— Could I have the television on? 　　—— Yes, you can. / No, you can’t. 在否定，疑問句中表示推測或懷疑。 He couldn’t be a bad man. 他不大可能是壞人。 比較may和might 表示允許或請求；表示沒有把握的推測； may 放在句首，表示祝愿。 May God bless you! He might be at home. 注意：might 表示推測時，不表示時態(tài)。只是可能性比may 小。 成語： may/might as well，后面接不帶to 的不定式，意為“不妨”。 題一： If that is the case, we may as well try. Peter ___e with us tonight, but he isn’t very sure yet. A. must　 B. may　 C. can　 D. will 比較have to和must 兩詞都是“必須”的意思，have to表示客觀的需要，must 表示說話人主觀上的看法，即主觀上的必要。 My brother was very ill, so I had to call the doctor in the middle of the night.　 我弟弟病得很厲害，我只得半夜里把醫(yī)生請來。(客觀上需要做這件事) He said that they must work hard. 他說他們必須努力工作。(主觀上要做這件事) 在否定結(jié)構(gòu)中： don’t have to表示“不必” mustn’t表示“禁止”， You don’t have to tell him about it.　你不一定要把此事告訴他。 You mustn’t tell him about it.　 你一定不要把這件事告訴他。 must表示推測 must用在肯定句中表示較有把握的推測，意為“一定”。 must表示對現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測時，must 后面通常接系動詞be 的原形或行為動詞的進行式。 You have worked hard all day. You must be tired.你辛苦干一整天，一定累了。 （對現(xiàn)在情況的推測判斷） He must be working in his office. 他一定在辦公室工作呢。 比較： He must be staying there. 他現(xiàn)在肯定待在那里。 He must stay there. 他必須待在那。 must 表示對已發(fā)生的事情的推測時，must 要接完成式。 I didn’t hear the phone. I must have been asleep.　 我剛才沒有聽到電話，我想必是睡著了。 must表示對過去某時正發(fā)生的事情的推測，must 后面要接不定式的完成進行式。 ——Why didn’t you answer my phone call? ——Well, I must have been sleeping, so I didn’t hear it. 否定推測用 can’t。 If Tom didn’t leave here until five o’clock, he can’t be home yet.　 如果湯姆五點才離開這兒，他此時一定還未到家。 表示推測的用法 can, could, may, might, must 皆可表示推測，其用法如下： 情態(tài)動詞+動詞原形。 表示對現(xiàn)在或?qū)淼那闆r的推測，此時動詞通常為系動詞。 I don’t know where she is, she may be in Wuhan. 情態(tài)動詞+動詞現(xiàn)在進行時。 表示對現(xiàn)在或?qū)碚谶M行的情況進行推測。 At this moment, our teacher must be correcting our exam papers. 這時，我們老師想必在批改試卷。 情態(tài)動詞+動詞完成時。 We would have finished this work by the end of next December. 明年十二月底前我們很可能已完成這項工作了。 The road is wet. It must have rained last night. 地是濕的，昨天晚上一定下雨了。 情態(tài)動詞+動詞的現(xiàn)在完成進行時。 表示對過去正在發(fā)生事情的推測。 Your mother must have been looking for you. 你媽媽一定一直在找你。 推測的否定形式，疑問形式用can’t, couldn’t表示。 Mike can’t have found his car, for he came to work by bus this morning. 邁克一定還沒有找回他的車，因為早上他是坐公共汽車來上班的。 注意：could, might表示推測時不表示時態(tài)，其推測的程度不如 can, may。 情態(tài)動詞+ have +過去分詞 may(might) have + done sth, can (could) have + done sth 表示過去，推測過去時間里可能發(fā)生的事情。 Philip may (might) have been hurt seriously in the car accident. Philip can (could) have been hurt seriously in the car accident. must have +done sth，對過去時間里可能發(fā)生的事情的推測，語氣較強，具有“肯定”的意思。 —— Linda has gone to work, but her bicycle is still here. ——She must have gone by bus. ought to have done sth, should have done sth 本應(yīng)該做某事，而事實上并沒有做。否定句表示“不該做某事而做了”。 You ought to (should) have been more careful in this experiment. He ought not to have thrown the old clothes away.（事實上已扔了。） ought to 在語氣上比should 要強。 needn’t have done sth　本沒必要做某事 I dressed very warmly for the trip, but I needn’t have done so. The weather was hot. would like to have done sth 本打算做某事 I would like to have read the article, but I was very busy then. should 和ought to should 和ought to 都為“應(yīng)該”的意思，可用于各種人稱。 ——Ought he to go? ——Yes. I think he ought to. 表示要求，命令時，語氣由 should（應(yīng)該）、had better最好）、must（必須）漸強。 had better表示“最好” had better 相當于一個助動詞，它只有一種形式，它后面要跟動詞原形。 had better do sth had better not do sth It is pretty cold. You’d better put on my coat. She’d better not play with the dog. had better have done sth表示與事實相反的結(jié)果。 You had better have e earlier. would rather表示"寧愿" would rather do would rather not do would rather… than…　寧愿……而不愿 還有would sooner, had rather, had sooner都表示“寧愿”、“寧可”的意思。 If I have a choice, I had sooner not continued my studies at this school. I would rather stay here than go home. = I would stay here rather than go home. 題二： —Shall we go skating or stay at home? —Which ___ do?　 A. do you rather　 B. would you rather　 C. will you rather　 D. should you rather will和would 注意： would like； Would like to do = want to 想要，為固定搭配。 Would you like to go with me? Will you…? Would you like…? 表示肯定含義的請求勸說時，疑問句中一般用some, 而不是any。 Would you like some cake? 否定結(jié)構(gòu)中用will，一般不用would, won’t you是一種委婉語氣。 Won’t you sit down? 情態(tài)動詞的回答方式 問句　 肯定回答　 否定回答 Need you…?　Yes, I must.　 No, I needn’t Must you…?　Yes, you must. No, you don’t have to. 題三： 1. —Could I borrow your dictionary? —Yes, of course, you____. A. might　 B. will　 C. can　 D. should 2. —Shall I tell John about it? —No, you ___. I’ve told him already. A. needn’t　 B. wouldn’t C. mustn’t D. shouldn’t 3. —Don’t forget to e to my birthday party tomorrow. —______. A. I don’t　 B. I won’t　 C. I can’t　 D. I haven’t　　 帶to 的情態(tài)動詞 帶to 的情態(tài)動詞有四個：ought to, have to, used to, be to, 如加上have got to (=must), be able to，為六個。它們的疑問，否定形式應(yīng)予以注意： Do they have to pay their bill before the end of the month? She didn’t use to play tennis before she was fourteen. You ought not to have told her all about it. Ought he to see a heart specialist at once? ought to 本身作為情態(tài)動詞使用。其他的詞作為實義動詞使用，變疑問，否定時，須有do 等助動詞協(xié)助。 　　 題四： Tom ought not to ___ me your secret, but he meant no harm. A. have told　 B. tell C. be telling D. having told 比較need和dare 　　這兩詞既可做實義動詞用，又可做情態(tài)動詞用。作為情態(tài)動詞，兩者都只能用于疑問句，否定句和條件句。 need 作實義動詞時后面的不定式必須帶to，而dare作實義動詞用時, 后面的to 時常可以被省略。 實義動詞： need（需要, 要求） need + n. / to do sth 情態(tài)動詞： need，只用原形need后加do，否定形式為need not。 Need you go yet? Yes, I must. / No, I needn’t. need 的被動含義：need, want, require, worth 后面接doing也可以表示被動： need doing = need to be done 虛擬語氣 語氣的定義和種類 語氣：語氣是動詞的一種形式，它表示說話人對某一行為或事情的看法和態(tài)度。 語氣的種類： (1)陳述語氣: 表示動作或狀態(tài)是現(xiàn)實的、確定的或符合事實的，用于陳述句、疑問句和某些感嘆句。We are not ready. 我們沒準備好。 What a fine day it is! 多好的天氣啊! (2)祈使語氣: 表示說話人的建議、請求、邀請、命令等。 Open the door, please。請打開門。 (3)虛擬語氣: 表示動作或狀態(tài)不是客觀存在的事實，而是說話人的主觀愿望、假設(shè)或推測等。 If I were you, I should study English. 如果我是你，我就學英語了。 May you succeed! 祝您成功！ If條件句的虛擬 從 句 主 句 與現(xiàn)在事實相反 動詞的過去式 （be的過去式一般用were） would/should/could/might + 動詞原形 與過去事實相反 had + 過去分詞 would/should/could/might + have + 過去分詞 與將來事實相反 動詞過去式， should + 動詞原形， were to + 動詞原形 would/should/could/might + 動詞原形 第一層次：（基礎(chǔ)） 1) If S + were/did, S + would/should/could/might do (對現(xiàn)在的虛擬) 2) If S + had done, S + would/could/should/might have done (對過去的虛擬) 3) If S + were/did，S + would/should/could/might do (對將來的虛擬) should do were to do 第二層次： 如果If 省略的話，發(fā)生倒裝現(xiàn)象： 1) If I were you, I would go there. —Were I you, I would go there. 2) If I had walked fast, I would have caught up with Tom. —Had I walked fast, I would have caught up with Tom. 3) If it were to rain tomorrow, I would not go there. —Were it to rain tomorrow, I would not go there. 4) If it should rain, I would not go there. —Should it rain, I would not go there. 什么時候不能倒裝呢？ 1) If I worked hard now, I would get good marks. —Worked I hard now, I would get good marks. 2) If I had enough money, I would give it to the Hope Project.(the poverty-stricken areas) —Had I enough money, I would give it to the Hope Project. 開心自測講解 題一： C 題二：D 題三：D 題四：D 情態(tài)動詞 題一：B 題二：B 題三：1.C 2.A 3.B 題四：A