(something we all like doing!)
e.g. How many apples (C) can I have?
You can have all of them, if you want.
No, no, some of them would be fine. All of them would be too many! Thank you. You are very generous!
How much are the bananas? (You are asking the price - how much money (U) here)
see the A - Z of English Grammar & Usage for the rules.