Why is grammar so fundamental in learning a language?
So much has been written on this topic and for very good reason!
To construct a building, we need a sturdy foundation which will support the walls and roof. The same goes for learning a language. We need a structure to build phrases. This structure is comprised of verbs, nouns, adjectives, adverbs, and conjunctions. In linguistics this is known as metalanguage. The grammar of a language is its basic framework which allows you to combine a finite number of words in an infinite number of ways and still be understood immediately.