Section 山 Grammar
［语境自主领悟］
先观察原句 ① The topic of the poem can't be travel. ② It must be somethi ng more pers on al. ③ It may be frien dship. ④ It might be the journey through life. ⑤ Li Bai must have hada stra nge life. ⑥ He can't have been interested in a normal life. ⑦ He may have died when he fell out of a boat. ⑧ You should read the poem sometime. ⑨ Could you answer a few question§ please ⑩ I told her to stop singing，but she wouldn't liste n. ［语法精要点拨］
情态动词
后自主感悟 1 .句①一⑦中黑体部分在句中 均作推测；其中句⑤一⑦表示 对过去所发生的事情的推测。 2.句⑧表示说话人的意愿，意 为“应该”，句⑨表示“请 求”，句⑩表示意愿。
考点一一情态动词表推测 i ?情态动词表推测的三种句式
⑴在肯定句中一般用 must（—定），may（可能），might/could（也许，或
许）。
At this time my father must be workingin his office，isn't he? 在这个时候，我父亲一定正在办公室工作，是吗？ He was afraid they might not agree with him. 他担心他们可能不同意他的意见。
（2）否定句中用 can't/couldn't（不可能），may not/might not（可能不）。 They can't be at work now，for I saw them eat ing in the restaura nt just now. 他们现在一定没有在上班，因为我刚才看见他们在餐馆吃饭。 He may/might not know the scie ntist. 他也许不认识那位科学家。 (3) 疑问句中用can /could(能)。
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Could he have fi nished the task? 他可能把任务完成了吗？ Can he be at home now? 他现在能在家吗？
［即时演练1］用适当的情态动词填空 1. He must be ill.He looks so pale.
2. He was afraid they might not agree with him but I am not quite sure. 3. It can /could not be the headmaster.He has gone to America. 4. Some one is knocking at the door.Who ca n it be? 2. 情态动词表推测的三种时态
(1) 对将来情况的推测，用“情态动词+动词原形”。 She must/may/mightarrive before 5: 00. 5点前她一定/可能/也许到。
(2) 对现在或一般情况的推测，用“情态动词+ be” “情态动词+ be doi ng” 或“情态动词+动词原形”。
At this moment, our teacher must/may/might/could be correcting our exam papers.
这时，我们老师一定/可能/也许在批改试卷。
Mr.Bush is on time for everyth in g.How can/could he be late for the ope ning cerem ony?
布什先生一向准时，这次开幕式他怎么可能迟到呢？ (3) 对过去情况的推测，用“情态动词+ have+过去分词”。 I did n't hear the phone.l must have beenasleep. 我刚才没有听到电话，我想必是睡着了。
The door is locked.He can not have beenat home. 门锁着，他不可能在家。 ［即时演练2］单句语法填空
① Listen，he must be reading(read)English. 第2页
② Si nee no body gave him any help，he must have done(do) the research on his own.
③ It is important to know about the cultural differences that may cause(cause) problems.
3 ?情态动词表推测的特殊用法
(1) can除了表推测，用于疑问句和否定句中外，还可以表示“在某段时间内 一时的可能性”。
It can be quite windy there, especially in spring. 那里有时容易刮风，特别在春季。
(2) must表示“一定，非得；偏要”，强烈语气。 If you must smoke, you can smoke in that room. 如果你偏要吸烟，你可以在那个房间吸。 考点二 情态动词could，should和would的用法 1. could的用法
(1) could表示推测，表示某事有可能发生或可能是事实。在肯定句中没有 must那么有把握；在否定句中没有 can't那么有把握。
He couldn't be a bad man. 他不大可能是坏人。
(2) could还可以用于表示客气、委婉或礼貌的请求语气。 Excuse me, could you tell me the way to the bus station? 请问你能否告诉我去车站的路？
I'm afraid that we couldn't give you any definite answer at this moment. 恐怕我们这时还无法给您任何确切的答复。
(3) could have done表示“可能已经 . ”。此外，它还可以表示“本能够做 某事(而没有做)”，暗含惋惜之情。
You could have doneit well，but you were too careless. 你本可以做好的，但是你太马虎了。 Where could she have gonelast night? 她昨晚可能到哪里去了呢？ 2. should的用法
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18 19Module6SectionⅢGrammar情态动词
