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助动词 (Modal auxiliary) YanKang 主持
Might and could

Might 和 could 是 may 和 can 的过去式,但通常没有过去时态的意义。 它们都属于弱助动词,许多情形下意思接近。Could 比 might 常用。

弱助动词的“可能性程度”是,有可能但可能性不大--possible, but unlikely. 即,一种不过半的可能性。
比如:"They might offer you the job."
"Yes, but, they might not!"
One day I could/might become a billionaire, but the chances are very small.

两者的区别:





 






 

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1,Could 可用于请求requests、许可permission,might 很少这样用。比如: Could you wait over there, please? I wonder if I could borrow your pen?
2,Could 可用于表达能不能: In those days, you could buy a car for $200.
3,在否定中,两者意思有别:
You couldn't have met her=你不可能和她见过面。
You might not have met her=你有可能并未和她见过面。     下 页