Progressive

（1）进行体/时

（2）顺[同化]

(1) A term used in the grammatical description of verb forms, referring to a contrast of a temporal or durative kind, and thus handled sometimes under the heading of tense and sometimes under aspect. The usual contrast recognized is between ‘progressive’ or ‘continuous’ and non-progressive or ‘simple’. Linguists prefer an aspectual analysis here, because of the complex interaction of durational, completive and temporal features of meaning involved; traditional grammars, however, merely refer to ‘simple tense forms’, etc., and thus imply a meaning which is to some degree an oversimplification.

(2) A term used in Phonetics and Phonology as part of the classification of types of assimilation. In progressive assimilation one sound influences the following sound. It is opposed to regressive and coalescent assimilations.

（1）对动词形式做语法描写的术语，指时间或时长方面的一种对立，因此时而作为时，时而作为体来对待。通常区分是“进行体”或“持续体”和非进行体或“简单时”的对立。语言学家倾向于按体来分析，因为涉及的意义有延续、完成和时间等特征复杂得交织在一起；但是传统语法只称“简单时形式”等，所含的意义就有过于简化之嫌。

（2）语音学和音系学用来给同化分类。顺同化是一个音影响后头一个音。顺同化对立于逆同化和聚结同化。