高中英语《Unit 2 Healthy eating》period 2课件 新人教版必修3

1、Healthy Eatingperiod 2Learning about LanguageWarming UpPrepare for “discovering useful words and expressions” on page 12.Ex 1.lie 2. get away with 3. raw4. curiosity 5. customer 6. benefitEx 2.2. ought to 4. diet 5. raw 8.balanced9. energetic 10. slimbecome thinnerlose weight3. being laughed at by h

2、er friendslosing face6. felt so sad and hopeless about herselflose heart7. was unwilling to visit any morelose interest in visitingPrepare for “Discovering useful structures” on page 13.Ex 2.ought to; shouldnt; neednt; dont have to/neednt; will2. have to; mustnt3. ought to; shouldPresentationGrammar

3、_ _ 主要情态动词Can, couldMay, mightMustOught toNeedDare, daredcan表能力：I can read very fast.表客观可能性：Mary cant be the leader.表允许：You can take it away.表怀疑：How can you finish it?could表能力/可能性：Could you finish it soon?表怀疑：He could not be 50.委婉地提出问题：Could you show me the passport?用于虚拟：If you had come, you could h

4、ave got a wonderful gift.may询问或说明可不可以做：May I ask you a question?表可能会发生：He may get angry.表目的或让步的从句：Come here in time so that you may see the singer.might表可能的事：（同may）表目的从句： （同may）用于虚拟： If you had finished it, the boss might have given you some promotion. must表必须做的事：You must hand in your homework this

5、Friday.表揣测：It must have rained last night.表“偏偏”的意思：He must get a fever when we were ready to get off.ought to 表应该做的事：You ought to do it carefully.表非常可能的事：He ought to be here by now.need表需要；主要用于否定句或疑问句：We neednt hurry.可用于否定意思的句子：I dont think you need do it.作及物动词，和不定式连用：He didnt need to say that to he

6、r.dare表“敢于”，主要用于疑问句、否定句和条件从句：He dare not tell him the news.作及物动词，与不定式连用：We dont dare to enter the house.shall用于第一，三人称疑问句，征求意见或请求 shall 第二，三人称陈述句, 命令,警告,允诺,威胁 should 表劝告，建议，命令，顺理成章 ought to 表应该，语气should美语中，ought to用于否，疑句时to 可省。多数情况下，ought to可与should互换使用。疑问句中常用should代替ought to。Ought to的反意疑问句用shouldnt替

7、代。Ought to表示“想必会”时语气较must 弱。shall , should &ought to你最好不要抽烟了。 You should/ ought to stop smoking.You ought to have helped him with his English, _ ?wont you B. ought not youC. shouldnt you D. wouldnt you他们想必已到那儿了。They ought to be there by now.(语气较must 弱)比较had better, should & ought to 三者均表示建议，意为“应该”，“

8、应当”或“最好做”. 三者的语气程度为渐强。had better指一般性的建议，最弱。should&ought to含义相近，常可互换。区别在于，ought to常指特殊情况下的“应当”。Should则指一般情况。见例句。You ought to help him because he is in trouble now.(语气强，有命令意味。)You should have a rest after finishing your sports.（一般性建议）have to have to 表示客观需要去做的事情，意为“必须，不得不。” I have to get the station ea

9、rly to catch the first train.We missed the bus so we had to walk home.We have to overcome all kinds of difficulties.Have to 有多种时态。常见的有：一般将来时We will have to gather at the school gate at 7 tomorrow.一般现在时I have to take more money with me because my girlfriend has so much to buy.一般过去时Finally, we had to

10、give up our idea to hold a picnic outside as it rained for a whole afternoon. have to （考点）Must they do? Yes, they must. No, they neednt/dont have to.must & have tomust have to主观客观 主观 客观时态 现在，将来 多种表推测询问意愿否定意禁止，不允许 不必 must表主观意志，而have to表由于客观因素不得不做完成的事情。Must没有过去式，除在间接引语中可表示过去的时间。在直接引语中表示过去的时间用had to代替。

11、I told her that she must give up smoking.She said, “We had to get everything ready that night.”比较must & have toNeed I do ? Yes, you must. No, you neednt. dare & need情态动词实义动词dare否，疑，条 dare not do否,疑dont dare to do dont dare do不用于肯定句肯：dare to do need否，疑 neednt do (dont) need sth (dont) need to do肯：mus

12、t, have to, ought to, should注意对need问句的回答: -Need I finish the work today? -Yes, _. No, _. No, _.you mustyou needntyou dont have toneednt 对其它情态动词的回答:-Shall I tell John about it?-No, you _.-No, you _. -Must we do it now? -No, you _.-No, you _.needntdont have toneedntdont have toExercises高考链接1.-Is John

13、coming by train? -He should, but he _ not. He likes driving his car. (高考真题） A. must B. can C. need D. may2.It has been announced that candidates(候选人) _ remain in their seats until all the papers have been collected. (高考真题） A. can B. will C. may D. shall3.-I heard they went skiing in the mountains la

14、st winter. (高考真题） -It _ true because there was little snow there. A. may not be B. wont be C. couldnt be D. mustnt bePractice 1: 高考考题专练1. I thought you _like something to read, so I have brought you some books. A. may B. might C. would D. must 2. Where is my pen? I _it. A. might lose B. would have l

15、ost C. should have lost D. must have lost3. I didnt hear the phone. I _asleep A. must be B. must have been C. should be D. should have beenB D B 4. There were already five people in the car, but they managed to take me as well. It _a comfortable journey A. cant be B. shouldnt be C. mustnt have been

16、D. couldnt have been 5. Its nearly seven oclock . Jack _be here at any moment. A. must B. need C. should D. could D C6. Did the train arrive in time?No. It _ two hours ago.A. must have arrived B. ought to have arrivedC. must arrive D. ought to arrive7. Must I drive to his house and pick up the child

17、ren? No, . A. you shouldnt B. you might not C. you neednt D. you mustntB C 8. We didnt see Tom at the meeting yesterday. He it. A. mustnt have attended B. cannot have attended C. neednt have attended D. would have not attendedB 9. There is someone knocking at the door. it be Tom? A. can B. must C. should D. ought toA 10. Two years ago, my husband bought me a bicycle. If you live in town, it is often faster than a car and you worry about parking. A. must notB. may not C. should