2017届高考英语考前冲刺精选情态动词
情态动词无人称和数的变化,但却有一定的意义,表示一种看法。英语中的情态动词有: can, could, may, might, shall, should, will, would, must, ought to, need, dare, used to.
1. can 与could
1) 能力:
I can do it well.
He couldn’t support his family with his few pay.
2) 可能性或允许:
She can be free this afternoon.
She asked me if she could take the books of the library.
3) 表示惊异、怀疑等:
What you told me can’t be true.
How can (could) you be so careless!
4) could 可以委婉提出问题和看法,还可以用于虚拟语气中。
Could you give me some help?
I would help you if I could.
2. can与 be able to
can (could) 表示能力、可能性、允许、迟疑情绪等;be able to 只表示能力,可以有更多的时态形式。
表示能力,二者通用。
I can answer the question. = I am able to answer the question.
No one could answer the question. = No one was able to answer the question.
I’m sorry. I haven’t been able to answer your letter.
表示可能、允许、推测时用can。
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