Very/ much

Very:- is used before adjectives. Very is used before present participles.

Examples:- This book is very interesting.
This sight is very pleasing to the eyes.
I am very happy.
Much:- is use before adjective or adverb of comparative degree.

Examples:- I am much better now.
He feels much stronger nowadays.

My question is, why we say?

1- He is very tired. ( Very is used before present participle and adjective)
2- He is very pleased to know my result.
Why “very” is used here? are “tied” and “pleased” adjective or present participle?

Thank you.

Will you please tell me why we use “very” with tired and pleased instead of “much” ?