情态动词表示推测和可能性

Even experienced teachers can make mistakes. 即使是有经验的教师也可能出错。 ____________________________________________ Food poisoning can cause death. 食物中毒可导致死亡。 _______________________________________
2. “could+have done” 表示__________________ 本来能够做成某事 但结果没能做成，含有 遗憾的意味。
3. 疑问句中的推测，往往用can或could。
Mr.
Bush is on time for everything. How ______ it be that he was late for the opening ceremony？ A. can B. should C. may D. must

说出下列结构的含义
must
have done
肯定做过某事
can't
have done 不可能做过某事
may/might
have done 也许做过某事（肯定句）
can
have done 也许做过某事(疑问句）
解决Hale Waihona Puke Baidu态动词表推测的题目思路是：
1、判断句式， 2、看推测的把握有多大, 3、看推测的事情什么时候
①It's 8 o'clock now. He
should be in the office now. ②Hi, Mum! I'm on the bus. I should be home in about ten minutes.
注：can 有时也用于肯定句中表示推测， 主要用于表示理论上的可能性(即从理论上看是可 能的，但实际未必会发生)，或表示“有时”之意。 如：

2. - Good morning. I got an appointment with Miss Smith yesterday. - Ah, you ______ be Mr. Peter. A. might B. must C. would D. can
3. What do you mean, there are only ten tickets? There ______ be twelve. A.should B. would C. will D. shall 4. He is a good sportsman so he _____ win the match even he is injured. A. can B. might C. succeeded to D. was able to
③According to the speed, the car ________ arrive at Shanghai before it gets dark. A. shall B. should C. must D. need
should表推测时，“按 道理该如此”，一般句末 有时间状语，或有语境暗 示。
①Oh, I’m not feeling well in the stomach, I _____ so much fried chicken just now. A. shouldn’t eat B. mustn’t have eaten C. shouldn’t have eaten D. mustn’t eat ②—I’ll tell Mary about her new job tomorrow. — You________ her last week. A. ought to tell B. would have told C. must tell D. should have told
A. may be waiting B. may have waited C. must be waiting D. might wait

9. This cake is very sweet. You ______ a lot of sugar in it. A. should put B. could have put



C. might put
D. must have put luckily

10.——I left my handbag on the train, but someone gave it to a railway official.

——How unbelievable to get it back! I mean, someone ______ it. A. may steal B. might have stolen
7. —There is no light in the room. —_____ he be sleeping? A. Must B. Shall C. Can D. Will

8. Hurry up, he _____ for you at the school gate now.
2. 否定推测分为两种情况：

1）语气不很肯定时，常用may not, might not，
可能不、也许不 译为____________________ can’t ，译为“根 2）否定语气较强时，则用__________
本不可能”、“想必不会”，与must __________的意思刚好相 反。
二、“情态动词+完成式”
must have done can't have done may/might have done can have done
表对过去的猜测
should(ought to) have done shouldn't(oughtn't to havedone could have done need have done needn't have done
翻译：布什先生做什么事都很准时，他怎么 会开幕式迟到呢？
二、情态动词表推测时的时态问题
以must为例 must do/be 1、推测现在的事,结构是： eg. He goes to school with a big bag everyday. He must be a student.

你工作这么久以后肯定累了吧。
④She shouldn't be out in such an early morning.
她不会这么一大早就出去。
10/16/2016
一、情态动词表推测
1. 肯定的推测
一般用must,
should, ought to,may（might） must 的语 或could（不用can），其中，________ 气最强，译为“肯定”、“准是”、“想必 是”； should/ought to _______________的语气次之，译为“很可 may（might），could 能”、“应该”，指按常理推测； ____________________的语气最弱，译为 “也许”、“可能”。
5. Although this task ____ sound easy, great care is needed. A. must B. may C. shall D. should
6．---When can I come for the photos ? I need them tomorrow afternoon. ---They _____be ready by 12 : 00 . A. can B. should C. might D. need
情态动词近几年的考查趋势:有效信息越来越隐蔽;
情景越来越生动真实;考查的角度越来越细化综合化。
情态动词近几年的考查要点:
1. 情态动词的基本用法。
2. 情态动词表示推测和可能性,
3. “情态动词+ have done”。
4. 情态动词的特定用法。
一 情态动词表推测;
二 情态动词+have done； 三 解题技巧


1.--Is


John coming by train? --He should, but he ____ not. He likes driving his car.
B. shall C. may D. need
A. must
2.— Isn’t that Ann’s husband over there? — No, it _______ be him. I’m sure he doesn’t wear glasses. A. can’t B. must not C. won’t D. may not
1. It is usually warm in my hometown in March, but it _____ be rather cold sometime. A. must B. can C. should D. would
2. It’s nearly seven o’clock. Jack _____ be here at any moment. A. shall B. should C. can D. must
10/16/2016
Let's read and translate the sentences!
①She couldn't/can't be so stupid to do that.
她不可能去做那种事吧。
②I may be busy from tomorrow on.
从明天起我可能会忙起来。
③You must be tired after working so long.
表虚拟
1. “should（ought to）+完成式”表示 ____________________________ 。 本应该做某事而实际上没有做 “shouldn’t（oughtn’t to）+完成式” 表示某种行为 不该发生但却发生了 ______________________________ 。
发生。
小综合练习
1. —I think Helen is at home. —No, she _____ be, for she phoned me from the airport just five minutes ago. A. mustn’t B. needn’t C. can’t D. ought not
2、推测正在进行的事： must be doing eg.The light is off now. He must be sleeping.

3、推测过去的事：must have done/been eg. Lihua took a lot of photos in London. He must have visited the city.
①---- Are you coming to Jeff’s party? ---- I’m not sure. I ___ go to the concert instead. A. must B. would C. should D. might
②---Hi, tom. Any idea where jane is? —She _______ in the classroom. I saw her just now. A. shall be B. will be C. must be D. can be

C. must steal
D. must have stolen
11. - She looks very happy. She __ have passed the exam. - I guess so. It’s not difficult after all. A. should B. could C. must D. might 12. She ___ have left school, for her bike is still here. A. can’t B. wouldn’t C. shouldn’t D. needn’t