the past perfect
noun🔊/ðə ˌpɑːst ˈpɜːfɪkt/
🔊/ðə ˌpæst ˈpɜːrfɪkt/
(also the past perfect tense, the pluperfect)
[singular] (the form of a verb that expresses an action completed before a particular point in the past, formed in English with had and the past participle 过去完成时；过去完成式