Can we drop "more" in the usage of "couldn't agree with * more" to show we "agree"?
As many people know that when we say "I couldn't agree with you more" means "I absolutely agree with you.", one of my friends used it like this:
A: The coffee is quite good, isn't it?
B: Yes, I couldn't agree with you.
I know at that time he wanted to say "I couldn't agree with you more." but without "more" it sounds a disagreement in the past and all the examples I know in this kind of usages "couldn't" will always put with a comparative, such as "Couldn't be better", "Couldn't be worse"....