What role do diction and syntax play in creating a classic work of literature?
These both are science of writing a correct sentence.
Like word diction is correct word grammar usage, like
Air/Wind, Injure/Wound/ Sink/ Drown
At a glance we think the same meaning, but in reality you can't use each word in a same issue.
Like Air freshener, but you can't say wind freshener!
Do you notice the distinction?
"Air" word we use inside the room where no flowing the wind simply.
But we are on the boat where wind is blowing nicely.
This is the question of word diction.
I mean word grammar and context where you can't use same word in different context.
Soldiers were wounded in the battle field, but many people were injured by the plan accidents in Katmandu yesterday, etc
The titanic was sunk not drowned.
The child was drowned in our nearby pond, etc.
But what is the syntax of grammar?
Syntax is a form of grammar. It is concerned primarily with word order in a sentence and with the agreement of words when they are used together.
The cat washes its paw,
But you can't write the cat washes their paws, it doesn't make sense.
Syntax analysis makes us the grammar logical. Unless a writer has sense of logic in English, he will be unable to make his/her classical writing most sensible.
Hope it works.