What is the difference between progression and succession? In classical Chinese, for example, "er". Please tell me. Thank you.

Progression and succession are two different concepts in Chinese grammar.

The progression relationship is like a staircase, and the relationship between the sentences is advanced layer by layer; the succession relationship is like a pipeline , connect the sentences before and after.

The two parts connected by "er" focus on the temporal relationship, which can be translated as "just, then" or untranslated, indicating succession. For example: Yu Fang's heart is eager. Return, and make a loud sound on the water. ("Shi Zhongshan Ji") The "er" can be translated as "just", "continue" or not translated.

The two parts connected by "er" focus on the meaning. To further deepen and develop, it can be translated as "and, and", which means progress.

For example: A gentleman is knowledgeable and examines himself day by day. ("Encouraging Learning") where "and" means progress. Enter the relationship. Can be translated as "and" or "and". Su Shi's "Shizhongshan Ji"