Why does Frost invert the standard sentence pattern in line 1 of Stopping by Woods on a Snowy Evening?

In the first line of "Stopping by Woods on a Snowy Evening," Robert Frost subverts the normal subject-verb-object word order of a sentence for rhetorical effect.

Rather than writing, "Whose woods these are I think I know," he reorders it to "Whose woods these are I think I know."

This inversion creates emphasis, focusing the reader's attention on the speaker's uncertainty and the importance of the woods' ownership