much, more, most as adverb

 A         more and most can be used fairly freely:

You should ride more.    I use this room most.

But much, in the positive form, has a restricted use.

B         much meaning a lot can modify negative verbs:

He doesn't ride much nowadays.

In the interrogative much is chiefly used with how. In questions without how, much is possible but a lot is more usual:

How much has he ridden?    Has he ridden a lot/much?

In the affirmative as/so/too + much is possible. Otherwise a lot/ a good deal/a great deal is preferable:

He shouts so much that...   I talk too much.

But He rides a lot/a great deal.

C             very much meaning greatly can be used more widely in the affirmative. We can use it with blame, praise, thank and with a number of verbs concerned with feelings: admire, amuse, approve, dislike, distress, enjoy, impress, like, object, shock, surprise etc.:

Thank you very much.    They admired him very much.

She objects very much to the noise they make.

much (= greatly), with or without very, can be used with the participles admired, amused, disliked, distressed, impressed, liked, shocked, struck, upset:

He was (very) much admired.

She was (very) much impressed by their good manners.

D             much meaning a lot can modify comparative or superlative adjectives and adverbs:

much better        much the best              much more quickly

much too can be used with positive forms:

He spoke much too fast.

E             most placed before an adjective or adverb can mean very. It is mainly used here with adjectives/adverbs of two or more syllables:

He was most apologetic.         She behaved most generously