Why is Du Fu's "Guest Arriving" a classic seven-tone "writing unintentionally for poetry"?

The author has written many poems, so in the author's opinion, his poem has no style and only describes ordinary things, so it is unintentional. But as a famous artist, each of his poems is worthy of our observation, which is close to the author's life, and also describes the author's living environment and economic environment at that time, so this poem is of great use to the author's research.

The content described by the author in this poem is very simple and easy to understand. Mainly because he has guests at home. The author intends to clean up the house and meet his good friends at home. The language used in this poem is very unpretentious, but it is written so close. The star can also be said to be an unintentional poem, but it has become a very classic quatrain.

At first, I used a very cheerful style, because the place where Du Fu lived was shabby and shabby, but it was also beautiful in the pastoral style, especially in spring, surrounded by green water and full of spring, which gave people a quiet scenery with birds and flowers. Although it is simple, it is very suitable for people to live in. Hearing that my good friend was coming, Du Fu opened the door, cleaned the path in the yard and cleared the grass on both sides, because at home,

This sentence seems to say that the author is easy-going and doesn't care. In fact, it is because the host wants to entertain warmly, but he is not afraid of lack of money. He was very close to his master's living environment at that time, and vividly wrote that the author wanted to entertain friends, but he had no money to buy good food and drinks.