I would like to ask for your opinion on why much can not describe a normal adjective while it can describe a comparative form of an adjective. For instance, the sentence 1, 2 are wrong while 3, 4 are correct.
- I am much happy.
- He is much clever.
- I am much happier than you are.
- He is much cleverer than his brother.
I feel the sentence 1, 2 are weird and 3, 4 are natural. I get it. But, I would like to get any logical explanations on what would make that happen. I would appreciate any assumptions as well.