What syntax, imagery, themes, and metaphors are in the poem?

The first line has inverted syntax (the subject and
predicate are placed at the end):

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Whose woods these are I think I
know.

The imagery is as
follows:

• natural
  imagery: "woods," "snow," "frozen lake", "downy
  flake"


• sound imagery: "sweep
  of easy wind"; "bells"


• light/dark
  imagery: "snow" vs. "The darkest evening of the
  year."


• man-made imagery:
  "farmhouse," "harness," "village"

The
themes:

• Duty and
  Responsibility: "promises to
  keep"


• Beauty: "the sweep /
  Of easy wind and downy flake."


• Return to
  Nature (and this is the motif / metaphor as well):
  

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With sadness, "Stopping By Woods on a Snowy
Evening" examines just how difficult it has become in the modern world for man to stay
in touch with nature. The poem is made up of contrasting images of the natural and the
man-made: the woods and the village, the farmhouse and the lake, even the horse and the
harness-bells. The speaker is enchanted with the things of nature, but is constantly
reminded of human things, and, after a few minutes of giving in to the enchantment,
decides with regret that this return to nature cannot last. In this poem humanity is
represented not just by objects but by the concept of ownership. The first two words
focus attention on an absent character about whom we only find out two things: that he
lives in the village, away from nature, and that he owns the woods. It is the irony of
this, that the owner does not appreciate what he has, that establishes the poem's mood.
Man, it tells us, is wasteful.