1、必修三 Unit 2 Grammar 教学设计一、复习练习：can may shall should would must1. I _ keep my balance when I learn to ride a bike.2. You _ pay attention to your diet. You are too fat.3. We _ keep quiet in the library.4. Tom doesnt come to school today. He _ get ill.5. He promised that he _ get good grades next time.6
2、. If you steal things again, you _ be put into prison.二、学习：1. should和ought toa. should, ought to都可表示“应该”。ought to用于表示按道理应当，常指_，大多数情况下可用should代替，但比should语气重。I should help her because she is in trouble. You ought to take care of the baby.b. 表示劝告、建议或命令时，should 和ought to可通用，但在_中常用should。ought to的否定式为oug
3、htnt to或ought not to。You should / ought to go to class right away.我可以开窗吗？_你不应该离开的这么匆忙。You _ (ought to) leave in such a hurry. c. should, ought to都可表示推测。He ought to / should be home by now. This is where the oil ought to / should be.注意：should和ought to后面跟动词不定式的完成式, 其肯定句表示“_”, 其否定句则表示“_”。You _ the deci
4、sion a week ago.你应该在一周前就做决定。I _ such a foolish mistake. 我不应该犯这样愚蠢的错误。多数情况下，ought to可与should互换使用。ought to的反意疑问句用shouldnt替代。2. must和have tomust的用法 1) 表示_,主要用于_,意思为“必须，得，要”；由must引起的疑问句，肯定回答要用_,否定回答要用_ 。donthaveto,意思是“不必” ；2) must的否定形式mustnt表示_，意思是“不能，不许”。如： MustIfinishthetaskrightnow? Yes,youmust./Yes,
5、youhaveto. ( No, you _. / No, you dont have to.) You mustnt come here without permission. haveto的用法1) must表示_，而haveto表示一种客观的需要，意思是“不得不”。如： I have to attend an important meeting this afternoon. Mother is out, so I have to look after the shop. 2) haveto的否定形式是dont have to, 相当于neednt。如： They dont have t
6、o buy a computer at present. have to的第三人称单数形式是has to，一般过去式是had to，一般将来式是will have to。e.g. Li Hua has to pass an examination before he can start work. My car was broken, so I had to walk home. Itll have to be on a Sunday. Ill be working every other day.练习：1、The boss has given everyone a special holid
7、ay, so we _ go to work tomorrow. A. cant B. mustnt C. neednt D. shouldnt2、 What do you think we can do for our aged parents? You _ do anything except to be with them and be yourself. A. dont have to B. oughtnt to C. mustnt D. cant 3. must和needa. need作情态动词时, 只能用于_。构成否定句和疑问句时不借助于助动词do。 Need I finish t
8、he work today? Yes, you must. / No, you neednt.b. must的肯定形式表示“_”，否定式表示“_”。 You must come here. You mustnt take the book away from the library. need 1. 情态动词，肯定： 否定： 2. 实义动词， 肯定： 否定：1. You _to the meeting this afternoon if you have something important to do. A neednt to come B dont need come C dont ne
9、ed coming D neednt comedare 敢 1. 情态动词，肯定： 否定： 2. 实义动词， 肯定： 否定：1. 在晚上我不敢一个人看鬼片。 In the evening I _ horror movies alone.4、“情态动词have done”结构的用法 must have done _may / might have done _would have done _ could have done _couldntcant have done _should (ought to) have done _need have done _neednt have done
10、_练习：、选择：1. I didnt hear the phone. I _ asleep. A need be B must have been C need have been D should have been2. Peter _ come with us tonight, but he isnt very sure yet. A must B may C can D will3. “Shall I tell John about it?” No, you _. Ive told him already.” A neednt B cant C mustnt D shouldnt4. J
11、ohnny, you _ play with the knife; you _ hurt yourself. A wont; cant B mustnt; may C shouldnt; must D cant; shouldnt、翻译句子1你本不必提起那个人。 You _the person.2明天我不得不参加一个重要的会议。 I _an important meeting tomorrow.3你一定不要玩火，否则你将会被烧。 You _with fire，or youll get burnt.4在这么长的时间里，他本应该已经完成了工作。 He _the work in such a lon
12、g time.5我的自行车出了些问题，所以它需要修理。 Something is wrong with my bike，so it _.6Mary本不该说话的，但她想要警告你远离那个人。 Mary _ the words, but she wanted to warn you against that man.作业：Translate the following sentences. 1. I _ (得接受) your suggestion. 2. You _ (你不能来这儿) without permission. 3. You _ (应当去照顾) your brother.4. I think you _ (应当去看) the doctor. 5. The teacher told the students that they _ (不应该在课堂上沉默不语) all the time.6. You _ (就得不到我的支持) if you do such a thing.7. I waited for the train for two hours at the station this morning. Well, you _(本来没有必要那么早去的).8. “You _ (你千万不要再喝酒了),” the doctor warned him.
