perfective

In English, the perfective is often formed with the auxiliary 'have' and a past participle.

在英语中，完成时通常由助动词“have”和过去分词构成。

用法提示：这里的 perfective 是名词，表示一种时态或体。

The teacher explained that the perfective focuses on the completion of an action.

老师解释说，完成时强调动作的完成。

用法提示：perfective 指代完成时这一语法概念。

Linguists distinguish between perfective and imperfective aspects in many languages.

语言学家在许多语言中区分完成体和未完成体。

用法提示：perfective 作为名词，表示完成体。