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could等于什么短语

发表时间:2024-08-23 12:18:13 来源:网友投稿

be able to.1、当can ( could )作“有能力、能够”的意思时,可以和be able to 互换。

如:He will come if he can. =He will come if he is able to.I can see you tomorrow. =I will be able to see you tomorrow.2、can ( could )表示“请求别人的许可”,这时不可以和 be able to 换用。Mom , can I watch some TVCould you please turn it a little down3、 can ( could )表示“可能性” 也不可以用 be able to 替代。如:My mom can't be at home at this time .4、在表示“某个动作被成功完成、某个计划被成功实施”时,只能用 was able to ( be able to 的过去式),不可以用 could 。如:He was able to go to London yesterday and he enjoyed himself very much .

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