The poet uses personification by giving the snow a sense of movement and life, as seen in the line "drifting into hills of white." Additionally, the repetition of this line at the beginning and end of the poem creates rhythm and emphasizes the snowdrifts' significance in relation to loneliness and lost love.

can you write this like a 12 year old but keep it formal

The snow in the poem is moving and alive, like it's drifting into hills. The poet repeats this line to show how important the snowdrifts are in connection to feeling lonely and losing love.