2.shouldnt/oughtnt to+have done,意本不应该,含有责备或后悔意。
例如:You shouldnt have watered the flower./I oughtnt to have scolded her for such a small thing.
3.might have done,意过去可能做could have done意本能够做,两者都含有委婉批评或遗憾之意,也可表对过去情况的推测。
例如:He might have gone to Nanjing with Professor Wang. last week, but he was ill.上星期他本可以和王教授一起去南京的,可他病了。
We could have finished the work ahead of time.我们本来是能够提前完成工作的。四、情态动词在反意疑问句中的用法
1.肯定祈使句+附加问句结构,附加问句常用will/would/wont you形式。
例如:Stand still, will/would/wont you?
2.否定祈使句+附加问句结构,附加问句常用will/would you形式。
例如:Dont watch TV, will/would you?
3. Lets, shall we? ; Let us, will/wont you?
4.含有must句子的反意问句
1)must表示必须时,附加部分常用neednt,也可用mustnt.例如:He must go with you, neednt/mustnt he?
2)mustnt表一定不能时,附加部分用may.例如:She mustnt leave, may she?
3)must表一定、想必推测意时,附加部分主要有下列几种形式:
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