what is the verb & adverb in this sentece?.& why......"what books do you like most?"

Hi, it should be - "What books do you like 'the' most". The verb is 'like', and the adverb is 'most'. An adverb describes a verb or an adjective. So here we are talking about 'liking' a book, so that becomes an action, and 'most' describes the degree to which the book is liked.