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1.表示能力:can,could 及 be able tocan 表示现在或“一般的”能力。表示将来的能力也可用 can。如:We can hold another meeting tomorrow.明天我们可以再开一个会。由于 can 只有过去时的形式(could),当它需要用将来时、现在完成时及其他时态时,须用 be able to 代替。如:The baby will be able to walk in a few months.几个月后这婴儿就会走路。必须特别注意 could 与 was able to 的一个重要区别:was able to 不仅可表示“有做某事的能力”(have thepower or ability to do sth.),还可以表示“设法做了某
1. Ability: can, could and be able tocan means the present or the “average” ability. Indicates that future capabilities are also available. We can hold another meeting tomorrow. We can hold another meeting tomorrow. Since can is only a form of past, it should be replaced by what it is when it needs to be used in the future, now completed, and other tenses. The baby will be able to walk in a few months. Special attention must be paid to the important distinction between could and able to: not only can it have the power to do something (have the power or ability to do sth.), It can also mean "trying to do something