Hi,
Let me offer some more comments.
2. People use sentences like:
a) Could it be more interesting?
I comprehend it as "Its most interesting" being said emphatically. That is superlative form of the adjective is used, like the use of "most" in the way I understand it. Am I right?
Consider a TV set in a store, that has the price of $1. Coul;d it be more expensive? Yes, it could. The price could be $2, or $200. In other words, this question can just be a normal question, in such a context.
However, now consider that I find a TV set that has a price of $2,000,000. I say 'Could it be more expensive?', meaning that I think it could not be more expensive. This is a hyperbolic question, an exaggerated question that is not meant literally.
b) "I couldn't agree more".
My logic of understanding does not apply here, as a negative is being used. Please explain. The meaning here is that I agree so completely that it is not possible for me to agree more than that.
If you still have questions about this, please post again.
Please also note that the word 'doubt' is not normally used in the way that you are using it. Say 'I have questions' rather than 'I have doubts'. ![Smile [:)]](/emoticons/emotion-1.gif)
Best wishes, Clive