1. First of all, the second paragraph consists of two phrases, each with ***4 bars, which also belongs to the 4+4 square plastic paragraph structure.

Secondly, there is a mode shift in the second paragraph, and the tonality is changed from B flat to F major. The first phrase is 13- 16, ending on the main chord; The second phrase is 17-20, ending on the dominant chord, and here we are going to reproduce paragraph A.

3. Finally, the whole article forms an open paragraph with the characteristics of indicative statement.