It's quiet in the library, and you can hear the sound of a needle falling to the ground.

Methods of sentence expansion:

1. Local extension syntax.

That is, the sentence is divided into two parts-the subject part and the predicate part, and the front part is expanded first, and then the back part is expanded. For example, the front part of Xiao Ming Xue is Xiao Ming. First add who Xiao Ming is and my relationship, so that the front part can be expanded as "my classmate Xiao Ming"; The second half can add "where" and "how to study", so the second half can add "study hard in class". My classmate Xiao Ming is studying hard in class.

2. Expand the grammar as a whole.

Is to expand the two parts of the sentence at once. For example, according to what kind of red flag to raise, where to raise it and how to raise it, it can be unfolded into a bright five-star red flag and slowly raised on the top of the teaching building.