What sail on the seas according to the poem "Boats Sail on the Rivers"?

Kate Greenaway wrote the poem "Let's Play"./ Kate Greenaway is the writer of the poem "Let's Play".

According to the poem "Let's Play", it is fun when the school is over.

According to the poem "Let's Play", play begins when the lessons are finished.

As described in the poem "Let's Play", the students will compete with each other by running fastest and laughing loudest.

As described in the poem "Let's Play", the students will play after finishing the lessons.

According to the poem "Let's Play", the students are having fun, because their school is over and now they can play.