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1、2020;2020高考英语 最后30天语法精讲 情态动词1、情态动词 + have done sth这个结构有着特殊意义：用来表示猜测（设想可能发生过什么事情）或想象（设想可能出现过什么不同的情况）should (ought to) have done sth 本来该做而未做This wall oughtnt to have been painted blue.need have done sth 本来有必要做而未做You neednt have told her the news.must have done sth 对过去所做动作的肯定推测-We went to Paris. -That
2、must have been nice.can have done sth 对过去所做动作的否定或疑问推测I dont think he can have heard you. Call again.Where can John have put the matches?may (might) have done sth 过去可能发生某事，与could相比，may和might可能性较小，might 可能性更小；might 也可表示过去可能发生而未发生的事情。Pollys very late-she may (might) have missed her etrain.You were stup
3、id to try climbing there. You might have killed youselfcould have done sth推测过去”可能“发生某事 （同can, 但can不用肯定句）She could have gone off with some friends.表示过去没有实现的可能性：某事可能发生，但却没有发生You were stupid to go skiing there-you could have broken your leg.表示有能力做而未做（虚拟语气）You could have helped me !(You were able to hel
4、p me, but you didnt.)2、can could be able to 表示”能力“can 通常表示现在的或”一般的能力“-即你无论什么时候想做就能做到的能力, 指单纯的表示一个人有某种能力。You can certainly cook, even if you cant do anything else.be able to表示某人通过努力、克服困难做成某事。will be able to 表示将来的能力Ill be able to speak German in another few months.could 表达 ”一般的能力“-即你过去想干什么就可以干什么She co
5、uld sing like an angel when she was a kid.但could 不能表达过去某种具体的能力，此时用was able to,managed to 或 succeeded in 等How many eggs were you able to get ?3、can, could, may和might 表示”可能性“可用来表示：理论上的可能性（不涉及是否真发生）；提出建议（提出解决某个问题的可能办法或者采取的行动）；在问句或否定句中表达现在的可能性）Anybody who wants to can become a prison visitor.-What shall
6、 we do ? -We can try asking Lucy for help.Who can that be at the door ? Can it be Polly?may可用来表达：将来的可能性；说话时某事可能是真实的We may go climbing this summer.You may be right.could / might可用来表示：说话时某事可能是真实的；将来某事有可能发生，但不表示特别可能发生。You could be right, but I dont think you are.It could rain later on this evening.、can
7、, could, may 和might表示“允许” 请求允许：它们都可以表示请求允许做某事,could 和 might并不是表示过去Can (May, Could) I borrow your umbrella ? 允许：当我们允许某人做某事时，我们用can和may来表达，而不能使用could和mightYou may / can watch TV for as long as you like.(不用could, might; mustnt 有“拒绝”的意思）-Could I use your phone?-Yes, of course you can /may. (No, you cant
8、 / may not.)、can和could表示提议和请求它们常用来提议为某人做某事或请求别人做某事，could更客气，更含尊敬的成分，这种用法常见于陈述句和疑问句中提议：Can I carry your bag ?I could / can do the shopping for you, if youre tired.请求和命令： Could / Can you help me with this letter?You can / could start by cleaning the car.、情态动词will预测未来（第一人称用shall)，或发布命令-Theres someone c
9、oming up the stairs.-Thatll be Mary. Youll start work at six oclock.自愿与意向I will (不用 I shall) 表示自愿做某事，或主动提出做某事，或表达坚定的意图-Can somebody help me ? - I will.Ill break your neck.will you常用来提出要求或下命令，或提出请求Will you come this way, please?Will you have some more wine ?用wont表示拒绝No, I wont ! She wont open the doo
10、r.、shall用于第一人称，表示征求对方的意见(说话人做某事)。用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。用于第二、第三人称，表示说话人给对方的命令、警告、允诺或威胁。8、常用情态动词的回答 -Must we hand in our plan ?-Yes, you must. (No, you neednt.)-Need I come ?-Yes, you must. (No, you neednt.)-May I smoke here ?-Yes, please. (Certainly. / Yes, you may. )(No, you mustnt. / may
11、 not. / Please dont.)-Could / Can I offer you some coffee ? (提议)(-Will / Would you have some coffee ?)-Yes, please. / Yes, Id like some ,please. (不用Yes, you can.)(No, thank you.) (不用No, you cant.)-Could / Can / Would / Will you (please) open the door ?(请求) -Yes, of course (I will). (No, Im afraid I
12、cant.)情 态 动 词 专 项 练 习1.Hes in good health. Every morning he _ for a walk in the park.A. shall go B. go C. will go D. is going2. Would you open the door, please?Yes, I _. A.will B. do C. would D. can3.Whenever I was in trouble, she _ come to my help.A.was used to B. would C.always D. should4.Help me
13、with the heavy box, _ you?A. dont B.will C. do D. shall5. _ he open the window?Yes, please. A. Shall B. Will C. Ought D. Would6.You _ that article yesterday.A. should finish B. would have finishedC. should have finished D. ought to finish7.Why did you keep it a secret from me? I _ about.A.should be
14、told B. ought to have been toldC.should have told D. ought to be told8.She _ yesterday. Her mother was waiting for her all day.A. must have come B. should have comeC. would have come D. ought to come9. 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
