Locate the verb in the sentence then the subject and the object and immediately the conflict or plot is found in the verb, the characters are discovered in the subject and objects and the rest are just modifiers in the form of adjective and adverb words, phrases, and clauses. When I have a reader confused by the literature we just step back and analyze the grammar of a paragraph and miraculously the reader begins to see better. The subtly of non-fiction is built on grammar. Irony and satire are grammatical conventions. We see them when we see the grammar.
Authors are spoken about as one who can turn a phrase, that's grammar.
The art of persuasion is grammatical. Authors revel in grammar when they write. Teachers use grammar when analyzing literature. They show patterns, that is grammar. Readers can follow arguments that are well written because of the grammar.