could 和can的区别.could you help me with it?为什么不能改成can you help me with?it?

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could 和can的区别.could you help me with it?为什么不能改成can you help me with?it?
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could 和can的区别.could you help me with it?为什么不能改成can you help me with?it?
could 和can的区别.could you help me with it?为什么不能改成can you help me with?it?

could 和can的区别.could you help me with it?为什么不能改成can you help me with?it?
在询问当中,could的语气比can更委婉客气一些
其他情况下,用过去的时态中can要改成could,could是can的过去式