No, it is not.
Yes, correct but very awkward. It needs context. He could ever imagine what?
Not even close.
No, not even close. What exactly are you trying to ask?
Your question wasn't even grammatically correct enough for me to understand what you were asking.
Yes. The form who is the nominative, as opposed to whom.
The grammatically correct version in American English is "Even when you're right, you're wrong."
It is grammatically correct but not idiomatically correct - unless you refer to the creation of a political party. Speaking of a social event we say "have a party," "put on a party", "put together a party" or even "hold a party" so the correct idiom would be one of those.
Yes, this sentence is grammatically correct, but you really don't need the second "that."
The expression is "have a listen" and it is very informal without being grammatically incorrect.
Yes, fat and cat rhyme, but "Is the dog fat and look like a cat?" is not correct grammatically. It would have to be "Is the dog fat and does he (or she) look like a cat?" to be correct grammatically.
I have no idea what you are trying to ask as even though your question is grammatically correct it is not understandable.
No. The correct expression is "even though." Correct: Even though the assignment wasn't due until Friday, Ella decided to get an early start on it. Incorrect: Even although... Ouch, that's just bad. I can't even finish the sentence. But you get the idea. ;)