: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.，大小：72.0 KB
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