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.
Top answer
The following are correct: A: He must be the criminal. B: I couldn't agree with you more. (That is, I agree that he is the criminal.
— An0nymous
The following are correct: A: He must be the criminal.
B: I couldn't agree with you more.
(That is, I agree that he is the criminal.
) A: He must be the criminal.
B: I can't agree with you.
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A: He must be the criminal. B: I couldn't agree with you more. (That is, I agree that he is the criminal. The sentence, "I couldn't agree with you anymore.", is ungrammatical.)
A: He must be the criminal. B: I can't agree with you. (That is, I don't agree that he is the criminal.)