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实战演练实战演练1 I wonder if these are Dannys glasses?1 I wonder if these are Dannys glasses?They _ be Dannys. He doesnt wear glasses.They _ be Dannys. He doesnt wear glasses.A. cant B. must C. mustnt D. can2.2. Must I prepare for the trip today?Must I prepare for the trip today?No , you _ prepare for it today . You can do it tomorrow. No , you _ prepare for it today . You can do it tomorrow. A. need B. dont need C. neednt D. mustnt3.Robert, could you wash the car for me?3.Robert, could you wash the car for me?Yes , I _. Im coming , Dad.Yes , I _. Im coming , Dad.A. could B. couldnt C. can D. cant情态动词情态动词TODAYS TOPIC情态动词性质情态动词性质作为情态动词，它们有一些共同性质作为情态动词，它们有一些共同性质: :那就是那就是-多情多情！（！（Just kiddingJust kidding）情态动词共有的性质是：情态动词共有的性质是：1.1.不能单独作谓语，须和行为动词或系动词连用共同构成谓语不能单独作谓语，须和行为动词或系动词连用共同构成谓语2. 2. 无人称和数的变化无人称和数的变化（have tohave to除外）除外）3. 3. 后接动词原形后接动词原形do/bedo/be ( (这一点很重要这一点很重要) )4. 4. 具有助动词作用具有助动词作用（可用来构成否定句，疑问句）（可用来构成否定句，疑问句）常用情态动词图册常用情态动词图册情态动词情态动词cancan(1)表示表示能力能力时一般译为时一般译为“会，能会，能”，即有种能力，即有种能力,此时否定此时否定cant 意为意为“不会，不能不会，不能”She can swim fast, but I cant.I cant play the piano.情态动词情态动词cancan(2)表示表示推测推测，意味，意味“可能可能”，常用于否定句和疑问句中，此时，常用于否定句和疑问句中，此时cant意为意为“不可能不可能”-Can the news be true? 这个消息会是真的吗？这个消息会是真的吗？-No,it cant be true. 不可能是真的不可能是真的-I think Miss Gao must be in the library.She said she would go there-No,she_be there,I saw her just now.A. cant B. mustnt C.neednt D.wouldnt(3)表示表示请求或允许请求或允许，常用在口语中，意为，常用在口语中，意为“可以可以”(相当于相当于may,但不如但不如may正式正式)Can I have a look at your new pen? 我可以看一下你的新钢笔吗我可以看一下你的新钢笔吗?Can you come to my party?学会礼貌地给予答复学会礼貌地给予答复肯定回答：肯定回答：Sure, Id love / like to；That sounds good!否定回答：否定回答：Sorry, I cant.； Id love to, but Im afraid I have no time.情态动词情态动词cancan情态动词情态动词mustmust(1)must表示表示主观看法主观看法，意为，意为“必须，一定必须，一定”You must stay here until I come back.You must go and see a doctor because you have a fever.常考句型：常考句型：-Must I .?-Yes，you must.-No, you neednt. / No, you dont have to.难点：难点：must与与have to区别区别must “必须必须”侧重于个人意志和主观上的必须做某事，具有强制性的意味侧重于个人意志和主观上的必须做某事，具有强制性的意味have to “不得不不得不” 强调客观上的原因迫使不得不去做某事强调客观上的原因迫使不得不去做某事I know I must study hard. 我知道我必须努力学习我知道我必须努力学习My brother was very ill, so I had to call the doctor in the midnight.我弟弟病得厉害，我只得半夜里把医生请来。我弟弟病得厉害，我只得半夜里把医生请来。情态动词情态动词mustmust(2)must 表示表示有把握的推测有把握的推测，用于，用于肯定句肯定句The light is on, so he must be at home now.Jane must be at home, because I saw her walk into her house情态动词情态动词mustmust(3)否定形式为否定形式为mustnt, 表示表示“一定不要，绝对禁止一定不要，绝对禁止” You mustnt paly with fire. 不许玩火不许玩火 You mustnt be late. 一定不能迟到一定不能迟到情态动词情态动词needneed当当need作为情态动词时，表示作为情态动词时，表示“需要，必须需要，必须”，用法和其他情态，用法和其他情态动词一样，主要用在动词一样，主要用在否定句和疑问句中否定句和疑问句中肯定回答为：肯定回答为：must 必须必须否定回答为：否定回答为：neednt =dont have to 没有必要，不必没有必要，不必Need I open the door?Yes, you must.No, you neednt/No, you dont have to.难点：难点：need做做实义动词实义动词 和和 情态动词情态动词 的区别的区别need除了做除了做情态动词情态动词，还可以做，还可以做实义动词实义动词这时这时need就和其他动词一样，就和其他动词一样，有第三人称，单复数有第三人称，单复数need+n. 需要某物需要某物I really need a job.Plants need light in order to survive. need to do sth. 需要做某事需要做某事(主语通常是人主语通常是人)I need to buy some books You need to listen carefully in class.课后小练习课后小练习1 1、_ you pass me a pen? Id like to write down the phone number. _ you pass me a pen? Id like to write down the phone number. Sure. Here it is. Sure. Here it is.A. Can B. Need C. Might D. Must2 2、You _ worry about me. Its nothing serious. You _ worry about me. Its nothing serious. A. cant B. mustnt C. neednt D. wont3 3、 May I go to the cinema,mum? May I go to the cinema,mum? Certainly, but you _be back by 11 oclock. Certainly, but you _be back by 11 oclock.A. might B. mustnt C. cant D. must4 4、The man in the office _ be Mr. Black, because he went home just now.The man in the office _ be Mr. Black, because he went home just now.A. mustnt B. may not C. cant D. neednt
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