First of all, we should master the basic structure of the core paragraph.

Mode: topic sentence+supporting sentence 1, 2,3,4 ...

The combination of core paragraphs need not be too complicated, the center should be clear, and the level should be clear, so the total score structure is generally adopted to form the form of "topic sentence+supporting sentence".

The central sentence is usually located at the beginning of a paragraph. The supporting sentence proves the topic sentence from different angles, depths and breadth. Supporting sentences can be combined according to coordinate relationship, progressive relationship, turning relationship, causal relationship, conditional relationship and undertaking relationship.

Second, we should master the conventional unfolding method.

How to expand the core paragraph? The best way is to use hypothesis analysis, comparative analysis, causal analysis, citation analysis and analogy analysis on the basis of factual argumentation.