“情态动词+have_done”结构用法小结

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1) should, ought to表示“应该”，ought to表示 义务或责任，比should语气重。 1. I should help her because she is in trouble.
2. You ought to take care of the baby. 2) 表示劝告、建议和命令。should, ought to可通 用，但在疑问句中常用should。 1. You should / ought to go to class right away.
练习 B 1. I have lost one of my gloves. I____it somewhere. A must drop B must have dropped C must be dropping D must have been dropped
“情态动词+have done”结构用法小结
3 “may/might + have done” 一般只用于 肯定句或否定句，不用于疑问句，表示对过 去情况不肯定的推测，意为“也许已经…”。 “ might +have done” 还可以用来表示 “本来可能…”，但实际上没有发生的事。
“情态动词+have done”结构用法小结
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2) need 作情态动词用时, 常用于疑问句、否定句。 在肯定句中一般用must, have to, ought to, should代替。
1．You needn’t come so early. 2. ---- Need I finish the work today? ---- Yes, you must. / No, you needn’t.
“情态动词+have done”结构用法小结
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3, I told your friend how to get to the D hotel, but perhaps I ____ have driven her there. A could B must C might D should
“情态动词+have done”结 构用法小结
“情态动词+have done”结构用法小结
重庆市垫江中学 周洋 Add your company slogan
课文原句： 1. tell him/her that he/she should have studied,… 2. Frederick William Ⅰ, the king of Prussia, could never have imagined that his greatest gift to the Russian people would have such an amazing history.
“情态动词+have done”结构用法小结
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5, As you worked late yesterday, you __ have come this morning. (2006· 陕西) A needn’t A B mayn’t C can’t D mustn’t
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2, The weather turned out to be fine C yesterday, I ____ the trouble to carry my umbrella with me. A should have taken B could have taken C needn’t have taken D mustn’t have taken
A ,can’t have done sth 表示：“不可能做了某 事”，对过去的否定推测，把握较大。
“情态动词+have done”结构用法小结
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2. –I can’t find my purse anywhere. –You ___ have lost it while shoping.(重 庆· ３０) A. may B. can C. should D. would
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情态动词用法归纳 情态动词无人称和数的变化；不能单独使用，必 须与其后的动词原形构成谓语
Should / ought to dare /need 情态动词+have done 用法总结
should, ought to
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4 “need + have done”通常用于否定句或 疑问句中，表示不必做得事情却做了。
“情态动词+have done”结构用法小结
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5 “should/ought to + have done” 表示 “本该做某事而没做” “shouldn’t/ ought not to + have done”表示“本不该做的事 情却做了”。
should, ought to
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3) 表示推测
should , ought to (客观推测), must(主观推测)。 1.He must be home by now. (断定他已到家) 2.He ought to/should be home by now.(不太肯定) 3. This is where the oil must be.(直爽) 4. This is where the oil ought to/should be.(含蓄)
“情态动词+have done”结构用法小结
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考题感知： 1. She ___ have left school. For her bike is still here.(天津· ６) A. can’t B. wouldn’t C. shouldn’t D. needn’t
“情态动词+have done”结构用法小结
B
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4, We __have proved great adventures, but we have done the greatest march ever made in the past ten years. A needn’t B may not C shouldn’t D mustn’t
“情态动词+have done”结构用法小结
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6 “would rather +have done”意为“当时 宁愿做了某事”。 “would rather not have done”表示相反的含义，两者都有 “后悔”之意。
“情态动词+have done”结构用法小结
A, may have done sth 表示：“可能做了某事”， 对过去情况的推测，把握较小。
“情态动词+have done”结构用法小结
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3. What a pity! Considering his ability and experience, he ___ better.(江西· ２６) A. need have done B. must have done C. can have done D. might have done
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dare, need
3) dare和 need作实义动词用时， 有人称、时态和 数的变化。在肯定句中，dare后面常接带to的不 定式。在疑问句和否定句中，dare后面可接带to 或不带to的不定式。而need后面只能接带to的不 定式。 1. I dare to swim across this river. 2. He doesn’t dare (to) answer. 3. He needs to finish his homework today.
“情态动词+have done”结构用法小结
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6, I was really anxious about you. You B __ home without a word. A mustn’t leave B shouldn’t have left C couldn’t have left D needn’t leave
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dare, need
1) dare作情态动词用时, 常用于疑问句、否定句和 条件从句中, 过去式形式为dared。
1． How dare you say I’m unfair? 2． He daren’t speak English before such a crowd, dare he? 3． If we dared not go there that day， we couldn’t get the beautiful flowers.
“情态动词+have done”结构用法小结
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2. –I can’t find my purse anywhere. –You ___ have lost it while shoping.(重 庆· ３０) A. may B. can C. should D. would
D, might have done sth 表示：“本来可能…”， 指实际上没有发生的事。
“情态动词+have done”结构用法小结
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“情态动词+have done”结构用法小结 1 can/could +have done (1) “can/could +have done”的疑问形式 和否定形式表示对过去所发生的行为怀疑或 不肯定。 (2)“could + have done” 也可用于肯定句， 表示“可能已经…”的意思。此外，还可表 示过去没有实现的可能性，意为“本来可以 （可能）… ”。
“情态动词+have done”结构用法小结
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考题感知： 1. She ___ have left school. For her bike is still here.(天津· ６) A. can’t B. wouldn’t C. shouldn’t D. needn’t
“情态动词+have done”结构用法小结
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2 “must + have done” 只用于肯定句中， 表示对过去情况的肯定推测，意为“想必， 准是，一定”。
“情态动词+have done”结构用法小结
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“情态动词+have done”结构用法小结
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3. What a pity! Considering his ability and experience, he ___ better.(江西· ２６) A. need have done B. must have done C. can have done D. might have done
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7 “had better + have done” 用于事后的建 议，含有轻微责备的口吻，意为“当时最好 做了某事”。其否定形式 “had better not have done”表示相反的含义。
“情态动词+have done”结构用法小结
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