/ɪmˈpɜ:fɪkt ||; ɪmˈpɝfɪkt/noun [U] (grammar语法) used for expressing action in the past that is not completed 未完成时；未完成式: In ‘I was having a bath’, the verb is in the imperfect. 在I was having a bath这个句子里，动词用了未完成时。 It is more usual to call this tense the past continuous or past progressive. 未完成时一般叫做past continuous或past progressive（过去进行时）。