情态动词can, could在口语中相当于may, might,表示许可。通过以下的例子进行具体说明:
Can I help you, sir?
先生,我可以帮你吗?
could可表示客气的请求。
I am checking out. Could you give me the bill?
我要结帐。给我帐单好吗?
can, could表示能力,相当于be able to。
Of course we can wait.
我们当然可以等。
can,could表示怀疑、推测,一般用于疑问句或否定句。
Could it be the charge for the fruit?
这会是水果的费用吗?
can,could用于惯用语。can't help或couldn't help+动名词表示不得不、忍不住。
I can't help thinking you are ripping us off.
我不得不认为你们敲我们的竹杠。
下一篇: 专有名词
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