The progressive aspect in Chinese (Simplified) grammar refers to an action that is ongoing or in progress. It is a key element of the language and is essential for students who want to master Chinese grammar. The progressive aspect is typically formed using the « 在 (zài) » particle along with the verb in Chinese sentences. By understanding the positioning and usage of this grammar structure, learners will be able to express actions that are currently happening or ongoing actions over a period of time.