I have a book which says that very is used before present participle e.g. very interesting, very daring, very entertaining etc and much before past participle like much amazed, much grieved, much surprised etc. Then the author has given few exceptions where very is used with past participle e.g. very tired, very dejected, very contented etc.
He has given a few sentences in exercise section for error correction. One of them is :
Being much contented with the sincerity of the members of the staff, the chief minister said that the state needed sincere men like them.
As per him I need to replace much contented with very contented as it is from one of those exceptions.
My question is is there any other reason/ logic why very is used here not much, in other words Do I need to cram all those exceptions or there is any work around to find such errors in usage of much/very ?