摘要: can (1)表示能力.如: He can do it by himself. Two eyes can see more than one. (2)表示允许.如: Can I come in? You can go now. 在这种情况下.它与may意思接近.可换用.但问句中用may比用can语气委婉. (3)与be able to在表示能力上意思接近.可换用.但be able to 有更多的时态.而can只有现在时和过去时.如: No one can do it. (=No one is able to do it.) Will you be able to come tonight? (不能说:Will you can come tonight?) (4)其过去式could可用来比较委婉客气地提出问题或陈述看法.此时.could和can没时间上的差别.如: Could (Can) you lend me your bike?

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