正在 zhèngzài in the process of (doing something)
繁体 traditional:
听 listen: 
语法 grammar: 副词 Adverb
笔记 notes: See The Progressive Aspect of an Action.
话题 topic: 时间 (Time)
水平 Level: 基础 Elementary (HSK 1)
例子 examples:
- Bàogào guān zhǎng, wǒmen zhèngzài zhèr pánchá yī gè táo bīng.Report to commanding officer: we are interrogating a deserter.Source: Teahouse by Lao She 老舍茶馆