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1·Chapter 2 discusses three types of the perfective aspect.

第二章讨论三种完整体。

2·Through the research, the majority of scholars th ought that (?) had the sense of progressive aspect and perfective aspect.

通过研究发现，大部分学者都认为“-（?）”具备了进行体和完成体的意义。

3·It is mainly marked with perfective aspect and placed after verb or adjective to express the completion or realization of behavior, condition of action.

它主要用作完成体标记，位于动词或形容词后，表示动作行为、状态的完成或实现。