modalverbs情态动词.ppt

Language,Modal verbs 情态动词,Can Could 能够 May Might 或许 Must 必须 Ought to 应该 Shall Should 应该 Will Would 会,Common Modal Verbs: 常见的情态动词：,P.S: Today we just learn three of them: can, may, must.,1. Modal verbs do not take “-s” in the third person. 第三人称后不需要加“-s”。 e.g. He can speak Chinese. 2. 否定句 直接在情态动词后加 “not”. e.g. They may not come to the party. 3. Many modal verbs cannot be used in the past tenses or the future tenses. 许多情态动词不能用于过去时或者将来时。 e.g. She musted study very hard.,Modal verbs are special verbs which behave very differently from normal verbs. 情态动词是特殊的动词，它们和其他单词很不一样！,x,Can (be able to),“Can” 是最常用的一个情态动词。它能用来表示 能力、许可和可能性。 e.g. I can ride a horse. Can I use your pen? You cannot spell. Can的过去时 could /kud/,Using “can” in present and past,Ask and answer,Can Kitty spell? Yes, she can.,_ Derek _? _,_ Kitty _? _,_ Kitty _? _,Can,multiply,Can,Can,No, he cant.,subtract,Yes, she can.,Yes, she can.,add,“may” 常被用来表达可能性，也可以表示请求。 表示请求： May I use your bathroom? 表示可能性 ：I may go shopping in the afternoon. may的过去时 might He might be our new teacher. PS：might也可以表示推测，可能性比may小,语气更婉转。,may (perhaps) 也许,可能,Using “may” in present, future and past,“Must” 用来表示确定的意思，表示必须，一定 。 必须： You must buy a ticket. 一定 ： He must be our new teacher. must not 表示禁止 You must not park here.,Must (have to),What do the signs mean? Do you know?,You must not cycle.,You must be careful.,You must turn left.,You must not enter.,You must pay ten yuan.,You must keep silent.,You must not turn right.,You must not smoke., 情态动词,情态动词不能单独作谓语动词，后接其它 动词原形做谓语，没有人称和数的变化。,表示能够或不能做某事用can 或 cant; A bird can fly . Fish cant live without water. 2. 告诉人们必须或禁止做某事用must或mustnt; You must hand in your homework at once. You mustnt talk loudly in public.,3. 表示请求或允许做某事may 或can; May I come in ? Can I open the door ? 4. 情态动词的疑问句： 把 can may must 置于句首。 Can you play the guitar? May I come in? Must I finish the work today?,Notes : 1、can 和 be able to的区别 : be able to 有 人称数和时态的变化。 I can come tomorrow . He was able to help the old lady. I will be able to come tomorrow. 2、在回答must的疑问句时，否定回答常用 neednt 或dont have to表示不必，而不用 mustnt 。 Must we stay here ? No, you neednt . ( No, you dont have to .),Notes : 3、May?的回答可以有下列方式： Yes, of course. Yes, please. Sure. No, you must not. No, you cant.,Do exercise about modal verbs,1 John_ come to see us tonight, but he isnt very sure yet. A. may B. can C. has to D. must 2 They _ do well in the exam. A. can be able to B. be able to C. can able to D. are able to -May I take this book out? -No, you_. A. cant B. may not C. neednt D. arent,4 You_ go and see a doctor at once because youve got a fever. A. can B. must C. dare D. would 5 -Can you speak Japanese? -No, I_. A. mustnt B. cant C. neednt D. may not 6 Must I finish the work today? No, you _. A. dont B. wont C. neednt D. mustnt,7 You _ talk loudly in the library. A. dont B. mustnt C. neednt D. dont have to 8 - You must come here at six tomorrow morning. -Sorry, I _ be here so early. A. need B. can C. must D. cant 9 After a long walk, the old man_ be tired now. A. must B. has to C. need D. can,.用适当的情态动词填空：。 1.I can play football. _you swim? 2.Dont worry. You _ return me this book tomorrow. 3.My grandma is ill. You _ talk so loudly here . 4.I cant play with you. I _finish my homework first. 5.I_ get up early tomorrow. because I have a meeting. 6._you please open the window?,Can,may,cant,must,must,Can,9. Nobody _live without air. 10._he speak Chinese ?Yes ,a little. 11. The book _ be returned before Saturday. 12._I come in ?Yes ,please. 13. You _give up smoking at once. Its bad for your health. 14. Excuse me ._I ask you a question? 15. _you tell me where the station is ? 16. _ I finish the work now ?No, you _. You _ do it this evenin