1、Section Grammar复习情态动词语 境 自 主 领 悟先观察原句 后自主感悟They could go anywhere they wished.We could see the sun setting behind the white pagoda.We shouldnt waste a drop of water.It may be true.He might have some fever.Since it is raining，we have to stay indoors.We must learn English well.Must you listen to the l
2、oud music at night？1.句中情态动词表示“有能力做某事” 。2句中，情态动词表示“不应该(做某事)”。3句中情态动词表示“推测” 。4句中，黑体部分均表示“必须” ，但must 多表示主观意志，而 have to 多强调客观上的需要。5句中 must 意为“偏要，硬要” ，常常表示质问或不耐烦。语 法 精 要 点 拨1can 和 could (could 是 can 的过去式，语气更委婉)(1)表示能力。He can use the computer skillfully now，but he couldnt last year.他现在能熟练使用电脑了，但去年他不会。(2)表
3、示可能性(肯定句中表示“一时的可能性”)，可译为“有可能；有时会” 。Training by oneself in a gym can be highly dangerous.一个人在体育馆训练有时会很危险。(3)表示许可。Can/Could I have a look at your new pen?Yes，you can./No，you cant.我可以看一看你的新钢笔吗？可以。/不可以。名师点津can 表示允许时，在疑问句中用 could 更委婉，在回答中一律用 can。(4)can/could 在否定句、疑问句中表示推测或怀疑，译为“可能” 。That cant be Mary she
4、s in hospital.那不可能是玛丽她在住院。Someone is knocking at the door.Who can it be?有人在敲门。可能是谁呢？(5)cant 与 enough 或 too 连用，表示“再也不为过” 。You cant be careful enough.你再细心也不为过。(6)can 与 be able to 的区别。can 表示“能力”时，只有 can 与 could 两种形式，仅表示具备的能力，不说明是否实施了努力。be able to 表示“能力”时，可以用于各种时态， be able to 用于过去时态表能力时，侧重指经过努力而成功做到某事。T
5、he fire spread through the hotel very quickly，but everyone was able to get out.大火在整个宾馆内蔓延开来，但每个人都成功逃出来了。即时训练 1用 can，could，couldnt，be able to 的适当形式填空It was really annoying; I couldnt get access to the data bank you had recommended.Can I have a word with you? It wont take long.I was able to swim to th
6、e bank after the boat turned over.2may 和 might(1)表示允许或征询对方许可，might 表示更加委婉的语气。(有时可与 can/could 互换)May I watch TV after supper?Yes，you may./No，you mustnt.晚饭后我可以看电视吗？是的，可以。/不可以。否定回答时，用 cant 或 mustnt，不用 couldnt。(2)表示可能性，might 可能性更小。They might be having a meeting，but Im not sure.他们有可能在开会，不过我不确定。(3)may 放在句
7、首可以表示祝愿。May God bless you!愿上帝保佑你！(4)may/might as well动词原形，意为“不妨” 。If that is the case，you might as well try.如果事情是这样的，你不妨一试。即时训练 2 用适当的情态动词填空You may feel all the training a waste of time，but Im a hundred percent sure later youll be grateful you did it.Life is unpredictable; even the poorest might bec
8、ome the richest.May I smoke in this room?No，you mustnt/cant3must 与 have to(1)二者均表示“必须” ，但 must 是指说话人的主观看法，而 have to 则强调客观需要。must 用于一般现在时， have to 有更多的时态形式。I have to wait here because I have no umbrella with me.我不得不在这儿等，因为我没带伞。(强调客观需要)I must recite the text this morning.今天早上我必须背会这篇课文。(强调主观意志)(2)must
9、所构成的疑问句，回答的否定形式通常为 neednt 或 dont have to，意为“不必要，不用” ，而一般不说 mustnt (表示“禁止”)。Must we hand in our exercise books today?Yes，you must./No，you dont have to/you neednt.我们今天必须交上练习册吗？是的，必须交上。/不，没必要。/不，不需要。You mustnt smoke here.你绝不能在这里吸烟。(3)must 常表示有根据的、比较确定的推测(只用于肯定的陈述句)，译为“一定，必定” 。Your mother must be waitin
10、g for you now.你的母亲现在一定在等着你。(4)must 表示“偏要，偏偏” 。Why must you always interrupt me?你为什么非要一直打断我呢？即时训练 3用 must，mustnt，have to 的适当形式填空You must be careful with the camera.It costs!Must I turn down the radio now?No，you needt/dont have toMy brother was ill，so I had to call a doctor in.4shall 和 should(1)shall
11、用于第一、三人称的疑问句，用来表示征询对方意见或请求指示。Shall I open the window?我可以打开窗子吗？Manager，someone is waiting for you.Shall he come in?经理，有人在等你，他可以进来吗？(2)shall 用于第二、三人称的陈述句，表示说话人的意愿，有“允诺” 、 “警告” 、 “命令” 、“强制” 、 “威胁”等意思。You shall get what you want if you behave well.如果你表现好的话，你就会得到你想要的东西。(表示允诺)He shall be sorry for it one
12、day，I tell you.有一天他会后悔的，我告诉你。(表示警告)名师点津should 有时可用于某些从句中，表示说话人惊奇、失望等感情色彩，常译为“竟然，怎么会” 。I find it astonishing that he should be so rude to you.他竟然对你这样无理，真让我吃惊。5will 和 would(1)表示请求、建议，would 比 will 更委婉客气。Would/Will you pass me the ball，please?你可以把球传给我吗？(2)表示意志、愿望和决心，would 用于过去的情况。I will help you if you
13、meet with trouble.如果你有麻烦，我乐意帮你。She said that she would try her best to help us.她说她愿意尽自己最大的努力来帮我们。(3)will 表示规律，意为“注定会” ，过去时用 would。You will regret forever if you lose this golden chance.如果错过这次好机会，你注定会终生后悔的。(4)would 表示过去的习惯性动作；而 used to 表示过去常常做某事，强调现在不是这样了。Each time his mothers birthday came，he would
14、buy her a present.每次到他母亲生日的时候，他都要给她买一件礼物。(表示过去的习惯)My father used to go to the office by bike when he was young.我父亲年轻的时候总是骑车去上班。(现在不是这样了)即时训练 4用 will，would，used to 填空Whenever I was in trouble，he would help me.I used to drink coffee，but now I drink green tea.Fish will die without water.6need 和 dare(1)
15、need 作情态动词时，表示“需要；必须” ；dare 表示“敢、敢于” 。常用于否定句和疑问句中，后接动词原形，否定形式分别为 need not 和 dare not。You neednt answer him the question immediately.你不必立即回答他这个问题。Need we make the test?Yes，we must./No，we neednt.我们需要做这个试验吗？是的，需要。/不，不需要。If he dare go，Ill go with him.如果他敢去，我就跟着他去。(2)need 和 dare 常用作实义动词，有时态、人称和数的变化，后面可接带
16、 to 的不定式。You dont need to be told twice.不必告诉你两遍。Tom didnt dare to do it.汤姆不敢做那件事。7had better表示“最好” ，使用时常缩写为d better，无人称和数的变化，其否定式一般把 not放在 had better 之后。Youd better get some sleep.你最好睡一会儿。语 法 应 用 落 实.单句语法填空用适当的情态动词填空1Since you have finished your work，there is no point in staying any longer; you may
17、as well go home.2You can keep the book for a month.After that you must return it on time.3The boy could speak three languages when he was 12 years old.4It never occurred to me that she should lie to me again.5No student shall go out of the school campus after 10：00 at night without permission accord
18、ing to the school regulations.6You neednt get the machine repaired this week.I wont need it until next month.7It couldnt be the vocabulary that caused you the problem in the exercise because you know a lot of words.8Lucy doesnt mind lending you her dictionary.She needntIve already borrowed one.9I re
19、ally cant thank you enough.Its been an amazing day!10She dare not go out alone at night.单句改错1We can chose between staying at home and taking a trip.chosechoose2We must found ways to protect our environment.foundfind3So real friendship should able to stand all sorts of tests.should 后加 be4You may be c
20、arefulthe traffic lights arent working.maymust5If you tell him a secret，never will he talks about it with anybody else.talkstalk6I have been practicing for three weeks now，but I still couldnt get used to itin fact，Ive nearly killed three people.couldntcant7I thought although she was clever she must have difficulty learning a foreign language.mustmight8It has been announced that students will remain in their seats until all the papers have been collected.willshall
