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Grammar
语法系列
语法也是语言学习中非常重要的一部分，随着学习难度的增加，良好的语法基础势必会给我们带来很大的帮助~
此系列会更新：中高考语法系列~
语法知识——情态动词（下）
情态动词有can/ could/ may/ might/ must/ have to/ shall/ should/ will/ would/ ought to/ need/ dare等。情态动词没有人称和数的变化，有词义，但不完整，不能独立作谓语，必须和不带to的动词不定式连用。
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情态动词表推测
肯定句中一般用以下情态动词：must/ will/ would/ shall/ should/ can/ could/ ought to/ may/ might等；
否定句中一般用以下情态动词：can not/ could not/ may not/ might not等；
疑问句中一般用以下情态动词：can/ could
① 对现在或将来的推测：V-情 + V-原/be动词
eg: It is already 12:00. You must be hungry.
---Are you coming to Jeff’s party?
---I’m not sure. I might go to the concert instead.
② 对过去的推测：V-情 + have done/been
eg: The ground is wet. It must have rained last night.
You must have been out last night. I called you several times, but nobody answered.
注意其反意疑问句的形式：
V-情 + have been 有时间状语 wasn’t/weren’t
done didn’t
没有时间状语hasn’t/haven’t
eg: They must have been very tired yesterday, weren’t they?
The children must have watered the flowers yesterday, didn’t they?
The minister must have arrived in Shanghai, hasn’t he?
非常有把握的肯定推测用：must
非常有把握的否定推测用：can’t
把握不大的肯定推测用：may/might
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疑问句及感叹句中常使用：can
eg: Can this news be true?
How can you be so foolish?
How can it be that he was late for the opening ceremony.
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情态动词表示遗憾、责备和批评
should/ought to have done
本该做某事而实际上没做
shouldn’t/ought not to have done
本不该做某事而实际上做了
eg: You should come a little earlier.
You shouldn’t have left home without a word.
might/could have done
本来能够做某事而实际上没做
eg: ---I didn’t go to work yesterday because my car broke down.
---You could/might have borrowed mine. I didn’t use it testerday.
needn’t have done
本来没有必要做某事而实际上做了
eg: There is plenty of time. She needn’t have hurried.
had better have done
当时最好做某事
had better not have done
当时最好不做某事
eg: You had better have started earlier.
You had better not have scolded her.
wou ld rather have done 当时宁愿做某事
would rather not have done 当时宁愿不做某事
eg: I would rather have taken his advice.
The party turned out to be a failure. I would rather not have attended it.
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