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英语语法 情态动词,
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S主+情态动词+be+adj 对“性质”“特征”的推测
S主+情态动词+be+n 对“职业”“事物”的推测
S主+情态动词+V原 对经常性行为的推测
S主+情态动词+be+V-ing 对进行着的行为的推测
S主+情态动词+have+PP 对过去的行为的推测
特别提醒：情态动词表推测时
1、 can只能用于否定句和疑问句
2、 must只能用于肯定句（它的否定句和疑问句其实就用can来代替了）
3、 如句中有情态动词 + 完成时，定是对过去的推测 。
4、 句中如有表示不肯定的话语，如：I am not sure; I don’t know 之类，常选may /might的各种形式
4. 记住下面几组表示反劝的特殊的表推测的形式
1). could + have + PP表示本来能做到，但事实上没有做到。 He could have finished the task on time, but the heavy snow came.
2). couldn’t +have + PP表示本来不能做到，但已经做到了。 She could not have covered the whole distance, but in fact she arrived ahead of time.
3) needn’t + have + pp表示本不必做的，但已经做到了。 She needn’t have attended the meeting yesterday, but she did.
4.) should/ought to +have + PP表示 该做而没有做 The plant is dead. I should/ought to have given ot more water.
5) shouldn’t/ oughtn’t to +have + PP表示 不该做而做了。 You oughtn’t to / shouldn’t have taken her bike without permission.
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5. 记住下面对比表：
must只能用于肯定句（它的否定句和疑问句其实就用can来代替了）
1.must + have + PP 表示对过去肯定的推测，译为“一定是，准是” The road is wet. It must have rained yesterday.
2.can + have + PP 表示对过去的推测（限于问句中） Can she have said so? 他可能这样说吗？
3.can’t + have + PP 表示对过去的否定推测 He cannot have said such a foolish thing.
情态动词表推测的反意疑问句
情态动词表推测的反意疑问句，简单来说，就是以情态动词后的时态为淮，如句子里有明确的时间状语，则以其为准。以 must 为例：
eg. 1. You must be hungry now, aren’t you?
2. He must be watching TV , isn’t he ?
3 Tom must have lived her for a long time, hasn’t he ?
4. She must have arrived yesterday, didn’t she?
注：如选择题中（以She must have arrived yesterday, didn’t she？为例）既有didn’t she又有hasn’t she则以didn’t she？为最佳答案。
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