This famous poem(诗), Happy Rain on a Spring Night, was written by Du Fu(712—770, the Tang Dynasty)when he was living and farming in Chengdu. His farming experience taught him to be thankful(感谢)to nature and it is shown in this poem.
The very first word, "good", shows the poet's joy and love for the spring rain. The rain is good because it "knows" the proper time to come. Here the poet uses personification(拟人), as if the rain was smart enough to come in time for the farmers' busy season.
When the rain comes, it appears during the night without making any noise. Unlike the summer storms, the spring rain finishes its task without being known.
In the third couplet(对句), the poet describes a peaceful scene to us. In the night sky, the clouds look dark and heavy. It's a sign that there will be enough rain during the night. The light from the boat makes the dark scene a bit livelier.
Lastly, the poet starts to imagine. Tomorrow morning, he thinks, the city of Chengdu will become beautiful when all of the flowers bloom after the rain.