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1、Modal Verb I情態(tài)動詞 Unit 1 Grammar 情 態(tài) 動 詞 表 示 說 話 人 的 某 種 感 情 或 語 氣 ， 對 某 一 動 作 或 狀 態(tài) 的 某 種 態(tài) 度 。表 示 “ 需 要 、 可 以 、 必 須 、 應(yīng) 當(dāng) ” 等 。 什 么 是 情 態(tài) 動 詞 ？ (Modal Verbs) Underline the modal verbs Most ancient festivals would celebrate the end of cold weather. It is now a childrens festival, when they can dress

2、 up If the neighbors do not give any sweets, the children might play a trick on them. 7 /1 8 /2 0 2 1 3 Underline the modal verbs In European countries, people will usually decorate churches She would never forget him. At the Spring Festival in China, people may give children lucky money in red pape

3、r. 7 /1 8 /2 0 2 1 4 情 態(tài) 動 詞 的 語 法 特 征1. 情態(tài)動詞不能單獨(dú)做謂語,后接動詞原形。（除ought to; have to外） 2. 情態(tài)動詞沒有人稱，數(shù)的變化，但有 些情態(tài)動詞（如can, will）有一般式 和過去式的變化。 Modal Verb I may/might can/could will/would shall/should must/cant 7 /1 8 /2 0 2 1 6 can的主要用法是： 1. 表示能力： eg. The girl can dance very well. 2. 表示說話者的推測事物的可能性: eg. Can t

4、he news be true? 3. 在口語中, 表示請求或允許： eg. Can I sit here? can和could could的主要用法： 1. could -can的過去式, 表示與過去 有關(guān)的能力或推測: eg. I can speak fluent English now , but I couldnt last year. 2. could可以代替can表示請求, 但語氣較can客氣、委婉: eg. Could you lend me your dictionary? Could I use your bike? 用could 提問，答語用can （即：could 不能用

5、于現(xiàn)在時態(tài)的答語中） -Could I borrow your pen? -yes, you can. can和be able to辨析can(could)和be able to都可以表示能力，意思上沒有區(qū)別。但can只有現(xiàn)在式和過去式，而be able to則有更多的形式。如： Those bags look really heavy, are you sure youll be able to carry them on your own? 2 0 2 1年7月1 8日星期日1 0 may和might may 的用法：1. 表示請求、允許（比can較為正式） eg. May I come

6、in ? You may go now.用may 提問，否定回答用 must not (mustnt) 禁止、阻止 had better not 最好別 may not 不可以 May I smoke here?Yes, you may. No, you mustnt No, youd better not. No, you may not. 7 /1 8 /2 0 2 1 1 2 2. 表示說話人的猜測（肯定句和否定句） 含有“也許”“大概” “可能”之意。 My friend may arrive this afternoon. 3. 表示祝愿; 但語氣較正式: eg. May you s

7、ucceed! May you have a good journey! might 的用法may 的過去時，表示可能性時，語氣顯得更加不確定。My friend might arrive this afternoon. 7 /1 8 /2 0 2 1 1 4 will和would Question: will/would 是助動詞還是情態(tài)動詞？ will 構(gòu)成將來時-助動詞。 表示“意志”“決心”“請求”-情態(tài)動詞。例： I will tell you something important. 我要告訴你一件重要的事情。（助動詞） Will you tell her that Im here

8、? 請您告訴她說我在這兒，好嗎？（情態(tài)動詞） will 和 would的用法1、表示請求、建議等，用于第二人稱 （用would比will委婉） Will you please take a message for him? Would you please tell me your telephone number? 2 0 2 1年7月1 8日星期日1 6 2.表示習(xí)慣或傾向， 意為“總是”，“習(xí)慣于”。 eg: Fish will die without water. People will talk. (人們總會說閑話。) When we worked in the same offic

9、e, we would often have coffee together. shall和shouldshall 用法 表征求意見，用于一、三人稱 ， （疑問句） Shall we go by train, Mom? Shall he attend the meeting? shall和shouldshall 用法 2.用于二 、三人稱 的陳述句中，表威脅、警告、命令、允諾等語氣 He shall be sorry for it one day, I tell you. You shall do as I say. If your children dont do as I tell you

10、, you shall not go to the party. （警告）(命令)(威脅) should 用法應(yīng)該=ought to （勸告、建議） You should study hard. You should read his new book.2. 表估計，可譯為“按理應(yīng)當(dāng)”、“估計”。 Try phoning Robert, he should be home now. should 用法3. 用于第一人稱，詢問意愿，語氣溫和委婉 Should I trust him? What should I do now?4. 萬一，用在if引導(dǎo)的條件句中，表示一件事聽起來可能性很小，但也不

11、是完全不可能?；蛑苯佑糜诰涫住f I should be free tomorrow, Ill come.Should I be free tomorrow, Ill come. should 用法5. “居然”，“竟然”,表說話人意料之外。 To my surprise, he should be a thief. Why should everyone want to marry Tony? must的主要用法 1. 必須，應(yīng)該。 語氣比should，ought to 強(qiáng)烈。 eg: Everybody must obey the law. You mustnt drive so fas

12、t in the street. 2. 表示有把握的猜測?！耙欢ā?、“準(zhǔn)是”結(jié)構(gòu)：must be eg: He must be an honest boy. 用must 提問，回答方式 肯定回答：yes, please / Im afraid so 否定回答 ：neednt / dont have to -Must I come back before ten? -No， you neednt.表猜測的否定或疑問句用can/could,不用mustnt. If Mary didnt leave here until 5:00, she cant be home yet. -_ I go out

13、 to play, mum? -No, you_. You should do your homework first. A. Might; wouldnt B. May; had better not C. Must; mustnt D. Need; mustntExercise 2. -Where is Emma? -I cant say for sure where she is, but she_ be out shopping. A. can B. should C. must D. may 3. The room is in a terrible mess; it _ cleane

14、d. A. cant have been B. couldnt be C. may have been D. would be 4. There _ be any difficulty about passing the road test since you have practised a lot in the driving school. A. mustnt B. shant C. shouldnt D. neednt 1 Children under 12 years of age in that country _ be under adult supervision when i

15、n a public library. (2004 上海） A. must B. may C. can D. need 2 Whats the name？ Khulaifi. _ I spell that for you？（2006 北京） A. Might B. Would C. Can D. Shall 3 Some aspects of a pilots job_ be boring, and pilots often _ work at inconvenient hours. （2006 湖南） A. can；have to B. may；can C. have to; may D.

16、ought to; must 4 The weather turned out to be fine yesterday. I _ the trouble to carry my umbrella with me. (2006 江西） A should have taken B could have taken C neednt have taken D mustnt have taken 5 Hows your tour around the North Lake? Is it beautiful? It _ be, but it is now heavily polluted. （2007 全國I） A. will B. would C. should D. must 6 I told your friend how to get to the hotel, but perhaps I have driven her there. （2007 陜西） A. could B. must C. night D. should