Find out the sentences that refer to each other and talk about its function

At first, I didn’t like tung flowers

Later, I discovered that in my city, there was a huge sycamore tree in the courtyard of the Education Bureau, so big that it almost took up half of the city. In the yard, there is only one tree, at the door, with lush branches and leaves. In April, I deliberately looked at it every day. Today it is still a flower, and tomorrow one will bloom. In a few days, the tree will be full of flowers, and the flowers are swaying in the wind. Flowers, almost ostentatious.

Through the attitude towards Tung Blossom before and after, it shows the change of the author's mentality and the longing for his close friend