#1  
Old 16-Dec-2007, 05:52
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Default why not 'can't' but 'couldn't'?

I read this question somewhere before and have been puzzled about the original answer of 'couldn't':

---Have some more cake.
---Oh, I couldn't/ can't. Thank you.

I thought both answers are all right and I'm more likely to say 'I can't'.
Do both 'couldn't' and 'can't' sound all right in the reply? Could you explain why?
I was hoping a native English teacher could give me the answer. Thank you very much in advance.

Thank you.
  #2  
Old 16-Dec-2007, 08:07
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Default Re: why not 'can't' but 'couldn't'?

Either is okay.
'couldn't' is usually taken to mean "I should not. It will make me fat!"
'can't' is more like "I am too full."
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