1. monograph. Based on the analysis of previous research results, this paper expresses opinions in the form of direct discussion and puts forward academic problems of a certain subject from the front.

2. Argumentative essay. This is a paper aimed at others' views on an academic problem of a certain subject, with sufficient arguments, focusing on exposing its shortcomings or mistakes, and expressing opinions through debate.

3. Summarize the paper. This is a kind of paper that introduces or comments on an academic problem of a certain subject on the basis of summarizing the research results of predecessors or present people to express their opinions.

4. Comprehensive papers. This is a paper written by organically combining summary and demonstration.