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除了表示“能够”,can, could还有一些其他用法,是不能用be able to代替的。这些用法主要是表示:
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1704926783
可能性(可译为“可以”、“可能”):
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We can call for you at nine.我们可以9点钟来叫你。
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1704926787
I’m like that—you can’t alter me.我就是这样,你不可能改变我。
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1704926789
He said he couldn’t come.他说他不可能来。
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It was so dark that we could see nothing.天是那样黑,我们什么也看不见。
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允许(可译为“可以”、“能”):
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Can I come in?我可以进来吗?
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You can’t smoke here.这里你不能抽烟。
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I asked if I could use her phone.我问可否用她的电话。
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I knew I couldn’t stay here.我知道我不能待在那儿。
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请求(可译为“可否”,用could显得更委婉):
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Could you lend me some money?你可否借我点儿钱?(比Can you…更客气点儿)
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1704926807
Could I borrow your thermos?我可否借用一下你的暖瓶?(比Can I…稍客气点儿)
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Could I have some more tea?我能再要一点儿茶吗?(也可用Can I…)
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1704926811
有时会:
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1704926813
Children can be very tiring.孩子有时很令人头疼。
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In winter, the winds can be pretty cold.冬天风有时很冷。
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Mary could be pretty naughty when she was a child.玛丽小时候有时很调皮。
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不相信或惊异(多用于否定句或疑问句):
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He can’t be more than thirty.他不可能超过30岁。
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How can you be so conceited?你怎么能这样高傲?
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How could you be so stupid?你怎么会这样傻?
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后面的动词可用完成或进行形式:
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Where can he have gone?他能到哪里去了呢?
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