imperfective aspect未完成体;未完成式;未完成貌
verbe imperfectifverbe imperfective未完成时动词
perfect imperfective of recent past近过去完成
imperfective four-comer in n dimensionn阶不全四角问题
ADJ（形容词） denoting an aspect of the verb in some languages, including English, used to indicate that the action is in progress without regard to its completion 未完成体动词的 → compare perfective
N（名词） the imperfective aspect of a verb 动词的未完成形式
N（名词） a verb in this aspect 未完成动词