八年级下册Unit2情态动词课件

1、 Unit 2 情态动词 Part 1：基本知识 一、情态动词是什么？ 行为动词 系动词 助动词 情态动词 能够独立做谓语 不能独立做谓语 掌握情态动词的定义：表示可能、怀疑、允诺、掌握情态动词的定义：表示可能、怀疑、允诺、 愿望、义务、必要、猜测等的动词是情态动词。愿望、义务、必要、猜测等的动词是情态动词。 二、情态动词的基本句型 陈述句 主+情态动词+ v原 疑问句 情态动词+主+ v原？ 考点：注意may, must疑问句的否定回答 否定句 -主+情态动词 not+ v原 考点：注意had better, need两种词性, ought to 的否定 三、常考的情态动词 can能; 可能

2、-could may可以-might must必须;一定 need需要-非标准情态动词 should-shall would-will had better used to 过去常常 Would rather 宁愿 ought to应当 Part 2：常考情态动词 能力 乐意 可能 cancan与与be able to be able to 的区别的区别 Can 是情态动词，不能独立做谓语是情态动词，不能独立做谓语 be able to是系动词，能够独立做谓语是系动词，能够独立做谓语 所有表示所有表示“意愿类题目意愿类题目”，都适用，都适用 Can/Could you give me some

3、 water? 此时此时can can 与与couldcould相等相等 cancan与与mustmust的区别的区别 Must肯定是（无否定）可能是肯定是（无否定）可能是 1. He will _ finish it by himself. can/ may/ be able to/ 不填（多） 2. can you give me _ suggestion? another/ other/ the other/ others 3. She _ run fast, but I cant. may/ must/ need/ can 乐意 可能 maymay的回答的回答 肯定回答一般是：肯定回答

4、一般是：Yes, please./Certainly./ Sure等，等， 否定回答一般是：否定回答一般是：Please dont./No，you cant/mustnt. can多用于多用于疑问句和否定句疑问句和否定句，表示怀疑或不相信等态度；，表示怀疑或不相信等态度； 而而may则多用于则多用于陈述句（肯定），陈述句（肯定），表示一种揣测。表示一种揣测。 cancan与与maymay的区别的区别 He may be right他可能对他可能对 He cant be right他不可能对他不可能对 必须 肯定 mustmust的否定回答的否定回答 肯定回答：肯定回答：yes, must 否定

5、回答：否定回答：no, you neednt/ no, you dont have to can多用于多用于疑问句和否定句疑问句和否定句，表示怀疑或不相信等态度；，表示怀疑或不相信等态度； Must表示推测时，不能用否定句表示推测时，不能用否定句 cancan与与mustmust的区别的区别 Dont have to 不必不必- mustnt一定不能一定不能neednt 不必不必 must 表必须有否定；表必须有否定； 表肯定，不能用否定句表肯定，不能用否定句 Must的否定 I didnt hear the phone. I must have been asleep. 我刚才没有听到电话，

6、我想必是睡着了我刚才没有听到电话，我想必是睡着了 情态动词 行为动词 You neednt answer the question now. You dont need ot answer the question now. Had better最好 易错点： 错误理解为had, 或better 否定 解析： 你最好立刻就做 You had better do it right now. 你最好不要碰它 You had better not touch it. Used to Be used to doing Be used to do He used to go shopping on we

7、ekends. 他过去常常周末去买东西他过去常常周末去买东西 The Englishman isnt used to driving on the right in China. 某人习惯于某人习惯于(to(to是介词）是介词） 被动语态（被动语态（toto是不定式）是不定式） Pens are used to write on paper. Would rather do.than do 宁愿做而不愿做 解析:宁愿而不愿，中考共三种表达方式 1、prefer to do.rather than do宁愿做而不愿 做(动词词组) 例:I prefer to swim rather than s

8、tay at home.我宁愿去跑 步也不愿待在家里 2、would rather do.than do宁愿做而不愿做(动 词词组) 例:I would rather swim than stay at home. 我宁愿去跑步 也不愿待在家里 3、preferto I prefer dogs to cats.相对于猫.我更喜欢狗. Would rather是情态动词，否定为 would rather not do Part 3：情态动词与助动词 Can与could的相同与不同 Can 能力能力 he said: “I can do that.” 乐意乐意 can I help you? 可能

9、可能It cannt be rainy Could 能力,是can的过去 式He said that he could do that . 表乐意,could可独立 一词.Could I go with you? (willwould; shall should于此 相似) Will 只用于将来时, he will come tomorrow 1. shall, will用来征求对方用来征求对方 意见，意见，shall用于第一人用于第一人 称，称，will用于第二人称，用于第二人称， 用来表示意愿；用来表示意愿；shall用用 于第二、第三人称，于第二、第三人称，will 用于第一人称。用于第

10、一人称。 Would 过去将来时，是will的过 去式.He said that he would come tomorrow. 表乐意 Would you like? 1.虚拟语气 1. The doctor suggested that he _ the medicine 3 times a day.多 Take/ took/ takes/ should take 解析 Suggest/advice that 主+should +v原。 考点: should 省略；给时态迷惑 2. She would leave the city if the rain _. Stops/ would s

11、top/ stopped/ stopping 解析: 1判断would-过去时，从句也用过去时 2主句过去将来，if 从句用一般过去 3.The patient knew that he _ the wrong mdicine. take/ took/ takes/ should take Part 4：真题解析与练习 1must和have to 【考例】-Must we finish giving out the posters today? -Yes, we _. It cant be put off any longer. 太原市 A. can B. may C. must 答案C。解析

12、 此题考查情态动词的用法。回答由must引起 的一般疑问句，其肯定答语要用must，不能用can或may。 故选C。 -I didnt pass the math test. I think I have spent too much time playing computer games recently. -I agree. You _ play like that any more. 河南省 A. neednt B. mustnt C. may not D. wouldnt 答案B。解析 此处选mustnt。表示“一定不能”“千万不能”， 用较强的语气来提醒对方不能再玩游戏了。 When

13、 traffic lights are red. We _stop and wait. 南 京市 A. may B. can C. must D. might. 答案C。解析 考查情态动词，must必须，表示禁止。 2can和could -Could I borrow your dictionary? -Of course you _.陕西省 A. can B. must C. should D. will 答案A。解析 上文的could并不表示过去，而只是一种 委婉的说法，所以答语用can更礼貌些。 -Listen! Is Tom singing in the classroom? -No.

14、 It _be Tom. He has gone to Paris. 长沙市 A. may not B. neednt C. cant 答案C。解析 因为汤姆不在这里，所以不可能是他。 一Mary，_you speak Chinese? 一Yes，only a little 北京市 A must B need C may Dcan 答案D。解析 考查情态动词，“玛丽，你会说英语 吗?“是的，会一点”。故选D。can表示能够 1Schools _allow students at least one hour a day for sports. A. would B. might C. shou

15、ld D. could 答案C。解析 此处用情态动词should的用法。should表 示“应当应该”的含义比其他三个词更强些。 2.Bob，may I _your MP4? 一SureBut youd better not _it to othersA.lend；lend B lend；borrow C borrow；borrow D.borrow；lend 答案D。解析本题考查动词borrow和lend的区别. 由语 境可判断前者是借入，用borrow后者是借出，用lend。 3.-What about playing football this afternoon, Sam? -I wo

16、uld rather _ at home than _ football. Its too hot outside. A. stay; playing B. stay; play C. to stay; to play D. to stay; playing 答案：A。解析本题考查了would rather的固定短语的 应用。Would rather do A than do B和做B比起来，宁愿做 A。 4.He used to _ in the sun, but now he is used to at night. A. read, read B. reading, read C. re

17、ad, reading D. reading, reading 答案：C。解析考查固定结构的用法。Used 后接动词 不定时，be used to 后接动名词。故选C。 5.You _do it if you really dont want to. A. neednt B. mustnt C. cant D. couldnt 答案A。解析 考查情态动词。本题应由句意人手破解。 如果你不想做的话，你“没有必要”做它，所以正确答案为 A项。 6.-May I do the rest of the work tomorrow? -Yea, of course. You _finish it tod

18、ay. A. must B. mustnt C. neednt 答案C。解析思路分析：根据句意可知，neednt不必 7.You _be tired after working for eight hours without a rest. A. can B. may C. must D. need 答案C。解析 本题考查情态动词must，can， may8need的区别。情态动词must在此表示肯定 的推测。 8.一Look at the boy running on the groundIs it Davis? It _be himI saw him go to the teachers

19、office just now A must B cant Ccould Dmight 答案B。解析 考查情态动词。表推测时否定句 中用cant。表示“不可能”，因为他已经去了老师 的办公室。 1._I open the window?Its hot here. A.Must B.Shall C.Will D.Would 2.Go and ask Mr Liu.He _tell you. A.may B.can C.would D.could 3._you please tell me the time please? A.Shall B.Will C.May D.Might 4._I try

20、 out all the ideas? No,you _. A. Must, mustnt B.Need,need C.Must,dont have to D.Must,dont 5._I speak to Mr Green，please? A.Will B.Could C.Must D.Would B A B C B 课时训练课时训练 9.He said Kate _come to the party.But I dont think so. A.could B.might C.need D.must 10.Need I do my lessons right now? Yes,you_. A.need B.can C.s