高中英语Unit 2《健康饮食 Healthy eating （Part 4）》（必修3）
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《Healthy eating （Part 4）》 情态动词表示推测的用法 情态动词常见惯用法及固定句型（can/could/may/might/must) 一对现在和将来情况的推测，形式为：情态动词+动词原形 二对正在发生的情况的推测，形式为：情态动词+be doing 三对过去发生的情况的推测，形式为：情态动词+have done 高考真题show (09重庆） 9.-Hi,Tom.Any idea where Jane is? -She (C) in the classroom.I saw her there just now. A shall be B should have been C must be D might have been (09江苏） 11.He did not regret saying what he did but felt that he(C) it differently. A could express B would express C could have expressed D must haved expressed 表示对现在和将来情况的推测，形式：情态动词+动词原形 1.应用：表示推测时（C)是正确的句子。 A He can come B May he come? C He could come D Must he come? 2.特别说明：can用于肯定句中表示推测的情况： The World Wide Web is sometimes jokingly called the World Wide Wait because it (D)be very slow.(2005浙江） A must B should C will D can 解释：当表示客观的（理论）可能性，意义为有时可能时，can可以用于肯定句中表示推测。这种用法常常可以说明人或事物的特征。 1.You (B)be hungry already-you had lunch only two hours ago!(2008浙江） A wouldn't B can't C mustn't D needn't 2.-Is there a basketball match between the Lakers and the Huston Rockets this evening?(2008江苏无锡模拟） -There (A)be.I'll phone the gym and find it out. A might B should C must D would 二表示对这横在发生情况的推测，形式为：情态动词+be doing译为（可能，一定...）正在..... 例题： 1.(B) he be watching TV now? A:Yes,he ( )be watching TV now. B:No,he ( )be watching TV now. A Must;can;mustn't B Can;must.can't C Can;can;mustn't D May;must;needn't 三 对过去的推测 情态动词+have done 1.must have done:对过去情况由极大把握的猜测 1.The lights went out.They (must have left)the office. 2.It (must have rained)last night,for the road was quite muddy. 2.May/might have done（无疑问） 1.It is too late.I think he (may have done)to bed.某事可能发生 2.He (may not have finished)the work.某时可能没发生 3.She was lucky enough.The tiger(might have eaten)her.本来可能发生而没发生 4.She (might have been eaten)by the tiger. 3.can/could have done 1.You (could have done)it better,but you were too careless. 过去有能力做到而实际上没有做到 2.Mary met Jack at the airport yesterday afternoon,so she (couldn't have attended)your lecture. 4.Should/ought to have done 1.You (should have done to)the meeting earlier 本该座而未作之事 2.You (shouldn't have told)her the truth.做了不该做的事 5.Needn't have done .We (needn't have taken)a taxi here,for it was very near to the school.做了没必要做的事 .注意：didn't need to do: .I (didn't need to clean)the windows.My brother did it. 没必要做实际也没做 特定语境下的态度和语气 .1.请求两回答： Yes,you may/certainly please May I come in? No,you mustn't./Please don't. Yes,you must Must I do it now? No,you needn't./don't have to 2.May 祝愿 (May) you succeed. 3.Might 忠告 You have broken two cups.You (might)try to be more careful. 4.Must 偏偏 1.Jouhn,look at the time,(must) you play the piano at such a late hour? 2.Could I have a word with you,mum? Oh,dear,if you( must). 5.Shall 一、三疑问表请求： (Shall) the young fellow have a try? (Shall) I have a second try? Shall 二、三警告、威胁和许愿： You (shall) fail if you don't work harder. You (shall) go out of the room ubless you stop taliking. You (shall) get a rise if you work harder. 情态动词常见惯用法： 1.had better do (not do) 2.Would rather do ...than do 3.Can not too/enough You (can't be too)careful when you are driving. You (can't)remember (enough)English words. 4.Can but do (只好） I (can but agree)with you. 5.can't help do sth. can't but do sth. can't choose but do 不得不、不能不 I (can't but admire)your courage. can't help admire can't choose but admire 6.may/might as well（倒不如、只好） You might as well do your present job before you find a new one. 7.May well do sth.（很可能） He may well say so./do that. 1.It is usually warm in my hometown in March,but it(B)be rather cold sometimes.(2008福建） A must B can C should D would 2.Thank you for all your hard work lat week.I don't think we (B)it without you.(2008山东） A can manage B could have managed C could manage D can have mansged 3.-Why hasn't the speaker turned up? -He (B) the flight!I'll find it out at once. A must have missed B might have missed C might miss D could miss Oversleeping will never make your dream come true.睡懒觉永远不会美梦成真。 Homework: Recite your notes.背诵笔记
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