人教版高一英语必修三-unit1-grammar-情态动词课件

1、Modal Verbs情态动词Hellen SkyModal Verbs情态动词Hellen SkyTongue Twister 绕口令1. Can you can a can as a canner can can a can?Can can你能够像一个罐头商一样装罐头吗?2. How many cookies could a good cook cook if a good cook could cook cookies?couldcould3. A good cook could cook as much cookies as a good cook who could cook coo

2、kiescouldcould如果一个好的厨师能做小甜饼，那么他能做多少小甜饼呢?一个好的厨师能做出和其它好厨师一样多的小甜饼。情态动词Tongue Twister 绕口令1. Can you cModal Verbs情态动词常见情态动词2情态动词一般用法及原则3情态动词表推测的三种句式4情态动词表推测的三种时态5定义1常见情态动词2定义1Modal Verbs情态动词常见情态动词2情态动词一般用法1. 定义 情态动词表示说话者的情感、态度和语气。它们本身有一定的意义，但没有人称和数的变化，不能单独作谓语，须和动词一起构成句子的谓语。表示否定时在情态动词后加not (must，have to除外

3、)，表示疑问时将情态动词提至主语前即可。It cant be true.May I help you?It can fly. 1. 定义 情态动词表示说话者的情感、态度和语1. can (could) 2. may (might)3. must (mustnt) 4. need5. ought to6. shall (should)7.will (would) 8. dare (dared)2. 常见情态动词1. can (could) 2. 常见情态动词2. 常见情态动词原形（过去式）用法含义例句can (could)表示能力(= be able to)能；会Tom can swim. =T

4、om is able to swim. 汤姆会游泳。(疑问句中)表示请求可以Could you give us a hand? 你可以帮我们一下吗？(否定句、疑问句中)表示可能性can可能cant不可能The boy cant be Jim. Hes much taller. 这个男孩不可能是吉姆。他要高很多。2. 常见情态动词原形用法含义例句can 表示能力(= be2. 常见情态动词原形（过去式）用法含义例句may (might)表示可能性(可与maybe互换)可能Tony may know the way. =Maybe Tony knows the way. 托尼可能知道路。表示客气请

5、求可以May I come in? 我可以进来吗？表示祝愿祝May you be happy! 祝你快乐！2. 常见情态动词原形用法含义例句may 表示可能性(可与m原形(过去式)用法含义例句must 表示义务、命令或要求必须We must tell the truth to our parents. 我们必须告诉父母真相。表示肯定的猜测（否定猜测用cant ）一定Lisa must be at home. 莉萨一定在家里。(推测现在的状况)You must be kidding! 你一定是在开玩笑！(推测现在正在发生的状况) They must have seen the movie. 他们

6、一定看过这部电影。(推测过去的状况)2. 常见情态动词原形用法含义例句must 表示义务、命令或要求必须We mu原形（过去式）用法含义例句shall(should)Shall. . . ? 用于第一人称，表示建议或请求好吗？Shall we ask the teacher for help? 我们向老师寻求帮助好吗？should用于各种人称，强调义务或责任应该Students shouldnt have long hair. 学生们不应该留长发。2. 常见情态动词原形用法含义例句shallShall. . . ? 用于第一原形（过去式）用法含义例句will（would）用于第二人称疑问句中，

7、表示征求意见或提建议愿意Will/Would you please take out the trash? 你可以把垃圾拿出去吗？will用于各种人称，表示意愿Your parents will try their best to help you. 你的父母会尽最大努力帮助你。2. 常见情态动词原形用法含义例句will用于第二人称疑问句中，表示征求意见或表能力表允许表推测表义务表意愿表虚拟3. 情态动词一般用法及原则情态动词表能力表允许表推测表义务表意愿表虚拟3. 情态动词一般用法及He may be at home. You cant take my notes.You should ha

8、ve arrived early.Students must finish their homework on time. 表猜测表允许表指责表命令3. 情态动词一般用法及原则1情态动词无三单变化2情态动词否定直接加not3情态动词后跟动词原形He may be at home. 表猜测表允许表指责表命Grammar Modals for Guessing Grammar 表示推测的情态动词有：must, can / could, may / might均可表示推测，但用法不同：表推测的情态动词can 不肯， may 不问，must 不否问注释：can表示推测通常不用于肯定句may表示推测通常

9、不用于疑问句must表示推测通常不用于否定句和疑问句肯定猜测的语气强弱：mustcan couldmaymight表示推测的情态动词有：表推测的情态动词can 不肯， may情态动词表推测分类推测分类肯定推测对现在、将来的推测否定推测疑问推测过去的推测情态动词+动词原型情态动词+ have done情态动词表推测分类推测分类肯定推测对现在、将来否定推测疑问推4. 情态动词表推测表推测的三种时态表推测的三种句式情态动词表推测肯定否定疑问现在过去将来4. 情态动词表推测表推测的三种时态表推测的三种句式情态动词4. 情态动词表推测1. 肯定句：must(一定）、can/ could(可能）、migh

10、t/may（也许、或许）e.g: He must/can/may/might know the answer to the question.2. 否定句：cant/couldnt (不可能），may not/might not (可能不）e.g: It cant/ couldnt be the Miss Lin. She has gone to America.3. 疑问句： can/could (能.?)e.g：Can he be at home now?表推测的三种句式情态动词表推测4. 情态动词表推测1. 肯定句：must(一定）、can/表推测的三种时态情态动词表推测4. 情态动词表

11、推测1. 对现在或一般情况的推测：“情态动词+be”/ “情态动词+be doing”“情态动词+动词原形”2. 对过去情况的推测：“情态动词+have done”3. 对将来情况的推测：“情态动词+动词原形”表推测的三种时态情态动词4. 情态动词表推测1. 对现在或一SummarySummaryLook at these sentences again and decide what they are talking about: a), b) or c)I think my French tutor might know one of them.b) unlimited present t

12、imeThey might have fallen behind.They might be sheltering in a cave.a) past eventc) something happening nowLook at these sentences again Complete the gaps in the sentences with the modal verbs. More than one answer is possible. She goes out every weekend. She _ have young children.2. He looks depres

13、sed. He _ be having some problems.must, cant, may, might, might not, couldmight not/ cantmay/might/couldComplete the gaps in the sente3. This woman looks like a scholar. She _ work at the university.4. His shoes are muddy. He _ be working in an office all day.could/ might/ maycant6. He often goes ab

14、road. He _ be working for the Foreign Office.might/ must/ may/ could5. Her clothes are all very expensive. She _ be earning a lot of money.must/ might/could/may3. This woman looks like a schRewrite the sentences using modal verbs and suitable verb forms. There may be more than one correct answer. Im

15、 sure shes relaxing in her room. She _ in her room.must be relaxing2. Perhaps the postcode was wrong, and thats why the letter never arrived.The postcode _ _wrong, and thats why the letter never arrived. might/ may/ could have beenRewrite the sentences using mo4. Its possible that Sam doesnt like cl

16、assical music. Sam _ classical music.5. Im sure John is not forty-five yet. John _ forty-five yet.may/might not likecant be3. I dont believe you failed the exam. You _ the exam.cant have failed4. Its possible that Sam does6. It is possible that hes studying astronomy now. He _ astronomy now.7. Maybe

17、 they lied to me about their adventure. They _ to me about their adventure.may/ might/could be studyingmay/might/could have lied6. It is possible that hes st8. Its quite probable that Bill didnt win the competition. Bill _ the competition.mustnt/couldnt have won8. Its quite probable that BiBest Choi

18、ce Do you know where David is? I couldnt find him anywhere. Well. He _ have gone far- his coats still here. A. shouldnt B. mustnt C. cant D. wouldnt Best Choice Do you know where2. Excuse me. Is this the right way to the Summer Palace? Sorry, I am not sure. But it _ be.A. might B. willC. must D. can2. Excuse me. Is this the rig3. Tom graduated from college at a very young age. Oh, he _ have been a very smart boy then. A. could B. should C. might D. must3. Tom graduated from college4. I heard they went skiing in the mountains last winter. It _ true be