The tone of this poem is wistful. It is wistful because as the poet watches the geese migrate, she envies the geese's certainty of knowing they will return home.
In this poem, the poet is observing the geese migrate, and notes the certainty they have they will arrive home. The poet envys them, wishing she could know with certainty if she was going home.
The imagery in this poems includes "...slant of the spring-time sun." Although the slant of the spring-time sun is alliteration, it's also a vivid description of the time of day.
Bet you can't Rhyme Like your running out of Time
The rhyme scheme in the poem is very reoccurring. The rhyme scheme is A, B, A, B, C, D, C, D, E, F, E, F, G, G. The reason, I believe, that the rhyming breaks it's pattern in the last two lines is to put emphasize on them.
Bet you a dime You can't sing a chime.
The theme of this poem is a longing for home. The poet's desire to be like the geese and know her way home reflects the longing we feel to return home. Whether we return home physically or spiritually.