The Poem:  alliteration/assonance/consonance

Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.

My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.

He gives his harness bells a shake
To ask if there is some mistake.
The only other sound's the sweep
Of easy wind and downy flake.

The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep.
And miles to go before I sleep.
 

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Many readers delight at discovering the h and s sounds in the poem, perhaps replicating the hiss of a sled moving through snow or, perhaps, even the sound of a breeze through the woods on a winter's eve. The repeated w sounds also make the lines more poetic through alliteration.