概要： 答案 A 该句意思是:“汤姆本来不该告诉我你的秘密,但他没有伤害你的意思。” 例题3. I was really anxious about you. you home without a word. (NMET2001) A. mustn't leave B. shouldn't have left C. couldn't have left D. needn't leave. 答案 B shouldn't have done为不该做了某事。 例题4. ---Could I borrow your umbrella, please? ---I’m afraid you _______. A. could B. can C. couldn’t D. can’t 答案 D 此题极易错选C。其实could在问句中表示请求,为了语气的委婉和客气才用过去式,而答句必须按
2017届高三英语语法复习教案之情态动词,标签：高三英语复习教案,高三英语备课教案,http://www.67jx.com答案 A 该句意思是:“汤姆本来不该告诉我你的秘密,但他没有伤害你的意思。”
例题3. I was really anxious about you. you home without a word. (NMET2001)
A. mustn't leave B. shouldn't have left
C. couldn't have left D. needn't leave.
答案 B shouldn't have done为不该做了某事。
例题4. ---Could I borrow your umbrella, please?
---I’m afraid you _______.
A. could B. can C. couldn’t D. can’t
答案 D 此题极易错选C。其实could在问句中表示请求,为了语气的委婉和客气才用过去式,而答句必须按照实际情况回答,故选can’t,以求和I’m afraid(在此表示婉拒)一致。
例题5. ---Don't forget to come to my birthday party tomorrow.
---______.`
A. I don't B. I won't C. I can't D. I haven't
答案 B will既可当作情态动词,表请求、建议、也可作为实义动词表"意愿、意志、决心",本题表示决心,故选B。
例题6. ----Shall we go skating or stay at home?
----Which ___ do?
A. do you rather B. would you rather C. will you rather D. should you rather
答案 B 本题考查情态动词would rather的用法,would rather +do sth 意为“宁愿”,本题为疑问句,would 提前,所以选B。
◆思考
几组情态动词的辨异
1. can 和be able to
情态动词can只有两种时态形式,现在式can和过去式could,而be able to有多种时态形式。例如:
① Mary can play the piano. She has been able to play it since she was 5. 玛丽会弹钢琴。她五岁起就会弹了。
用在过去时中,could经常表示能够做某事,事实上不一定去做,而was / were able to则表示“过去做成了某事”。在否定句中两者可通用。例如:
② He could swim across the English Channel. But he didn’t feel like it that day. 他能游过英吉利海峡,但那天他不想游。
③ Yesterday I was able to get home before the heavy rain. 昨天我在下大雨前赶到了家里。
2. must和 have to
must 和 have to 都可以表示“必须”,但有几点区别:
must 强调“内在的职责”、“义务”,而have to 强调“外界压力”、“不得已而为之”。^
have to可用于多种时态,而must一般用于现在时,其过去时与将来时分别由had to与shall / will have to代替。
在回答must引起的问题时,如果是否定的答复,不能用mustn’t,而要用needn’t或don’t have to,因为mustn’t是“一定不要”、“一定不能”的意思。例如:
① You must come to the classroom before eight. 八点前你必须来教室。
② It is raining hard outside, but I have to leave now. 虽然外面下着大雨,可我还是得走了。
③ ---Must we do it now? 我们必须现在做吗?
---No, you needn’t. 不,不必。
3. would和used to
used to表示过去与现在或过去某时与后来的情况有不同,而would只表过去的情况。例如:
① People used to think that the earth was flat.过去人们认为地球是平的。(现在人们不这么认为。)
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