有人问你，What do you think of the budget-cut?（你对预算削减有何看法？） 而你对这件事丝毫不“感冒”，你就可以回答：I couldn't care less.（我毫不在乎）。

这句话的意思是“我不在乎”，“没兴趣”，也就是：I don't care at all. 或 I don't give a hoot¹. 例如：

How do you like Mr. Lee's political point of view? 你对李先生的政见有何看法？

I couldn't care less. 我对这一点兴趣都没有。

但是有时说话者也“口是心非”： 例如：

I couldn't care less about the promotion² or pay raise. 我不在乎升级或加薪。

而实际上他是很在乎的，那么人家就会回答说： Yes, you do (care).

至于 I couldn't care more. 就是“我很在乎”(I care a lot.) 或 I care deeply.

同理：

I couldn't agree more. = I totally agree. 我完全同意。

I couldn't please you more. = I did my best to please you. 我尽量使你高兴。

I couldn't be more right. = I am totally right. 我完全正确。

但是老外为了“自尊”，不愿强调自己的错误，所以很少人说： I couldn't be more wrong. 注意：一般人都用否定句，但也有老外把肯定句与否定句互用，例如：

I could care less. = I care to some degree.

I could care more. = I care some.

主词可用任何人称代名词：he, she, you, we, they 等。但只用 could，不用 can.