Usage of couldn't and can't

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A: He must be the criminal.
B: I couldn't agree with you anymore. / I can't agree with you anymore.

 

 

A: How is the business?
B: It couldn't be better. / It can't be better.

 

Suddenly, I have become confused with usage of couldn't be and can't be. I have learned that could is used for a more polite meaning than can or less possibility but I do not know what grammar I should apply to those sentences. So do you think that they mean the same? Or what difference is there between them?

 

Thank you so much as always and have a good day.

asked Oct 29 '13 at 12:36 Hans Contributor

1 answer


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I think that both are grammatically correct. "It can't be better." means that you completely agree to the fact that has been said to you and "It couldn't be better." suggests your opinion in any discussion that you completely agree with what is said.

link comment edited Oct 30 '13 at 07:04 Scarlet Darwin Contributor

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