What are the characteristics of Robert Frost's poetry?

What are the characteristics of Robert Frost's poetry?

By using simple spoken language and conversational, Frost achieved an effortless grace in his style.
He combined traditional verse forms-the sonnet, rhyming couplets, blank verse-with a clear American local speech rhythm, the speech of New England farmers with its idiosyncratic diction and syntax.
In verse form he was assorted; he wrote in a form that borrows freely from the merits of both, in form that might be called semi-free or semi-conventional.