《情态动词表示推测》PPT课件

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会说出这种话的
• The weather in Tibet
could be cold now. 精选PPT
4
may
• may + 动词原形
• may have done (对过去
• may not +动词原形
• (对现在情况的推测), 其肯定式表示“可能”; 否定式表示“可能不”.
• He may be right; I may not be right.
came to see us.
school today.
• --It can’t be Terry. He’s now in London.
can’t have done (对过
•can’t + 动词原形(对现 在情况的推测),表示不
去情况的推测),推测 某事不可能已经发生。
可能.
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3
could
情态动词表示推测用法的比较
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must 只用在肯定陈述句中
• must+状态动原(对现 在情况的推测),表示 满有把握,“一定、想 必已”
• The man could eat all those apples, so he must have a good digestion.
• She must dislike such a man.
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(may表推测不用于疑问句:)
• 那会是真的吗
情况的推测),对已经 发生的事进行推测,意为 “可能已......”;否定式表 示 “可能还不.......”
• She isn’t here by now; she may have missed her train.
• He may not have known it.他可能还不知
• must have done(对过去 情况的推测),推测有把 握已经发生过事,即: “准是、 想必已......
• He must have arrived there already.
• Her eyes are red. She must have been crying long.
• He must be sleeping.
• Can that be true?
道那件事
• 不能说成:May that be
true?
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might
• might + 动词原形(对现 在情况的推测),可能, 但不及may肯定;其否定 式也不及mayn’t语气强
• He might not be there today.(今天他可能不在 那儿)
• Th We needn’t have hurried.
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1. 情态动词之间相互排斥,故不能同时使用;
2. 情态动词的过去式有时并不表示“过去”,而只起 “使语气委婉”的作用;
3. 情态动词表“推测”时,must语气最强,依推测 的“可能性”从大到小其顺序一般是:
• Could it be true?那会是 可能已.....
真的吗?
• We could have walked
• She couldn’t make
there; it was so near.
any mistakes on this matter.关于这个问题她
不应该犯错
• He couldn’t have said such a thing. 他应该不
8. He can’t be sleeping.
9. She must have been writing the paper for days.(她肯定几天来一直在写论文。)
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5. 在反意问句中,表推测的情态动词不出现 在简短问句部分,而其后的动词使用为: 句中有 过去时间状语的,问句部分用过去时,否则, 用现在完成时。例如:
表示某事本应该发生却未发生有责备意味mighthehavemissedshouldought动词原形对现在情况的推测只用在肯定句中表示该childrenshouldshouldhavedone过去情况的推测表示原本该但未做到含有较强责备口气后者更强youshouldhavetoldmeearlier
• might have done (对过 去情况的推测),但更 没把握;表示某事本应 该发生却未发生,有责 备意味
• Might he have missed the train?(他没赶上车 吗?)
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should ought to
• should + 动词原形(对 现在情况的推测),只用 在肯定句中,表示“该”
He must have been there yesterday, wasn't he?
He must have been there, hasn't he?
He can't have been there yesterday, was he?
He can't have been there, has he?
• could + 动词原形(对现 在情况的推测),表示可 疑的可能性,用在否定、 疑问及肯定句中.
• •
could have done
couldn’t have done (对 过去情况的推测),推测 某事可能已经发生或某事
• Could I borrow your
本来可能发生,但实际上
car?
未发生。;否定式表示不
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can表推测 用在否定句或疑问句中.
• 1.--There’s the doorbell. • Where can he have
• --Who can it be at this gone?他到哪儿去了?
time of day?
• He can’t have gone to
• 2.--It must be Terry that school. We have no
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shouldn’t oughtn’t to
• shouldn’t have done (对过去情况的推 测),表示“原本不该,但却做了”,含 有意味
• She shouldn’t have come here. (But she came.)
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needn’t
• needn’t have done(对过去情况的推 测),只用在否定句,表示“原本不 必做,但做了”,即:做了不必做的 事
• Children should be taught to speak the truth.
• should have done (对 过去情况的推测),表示 “原本该,但未做到”, 含有较强责备口气,后 者更强
• You should have told me earlier. (But you told late.)
4. must---can---could---may---might
5. 4. 情态动词+进行时(对现在活动的推测)或完成 进行时(对一直在进行的活动的推测)的用法:
6. --What can/could he be doing now?
7. --He may/might be watering the flowers.
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