pluperfect

noun

/ˌpluːˈpɜːfɪkt/

/ˌpluːˈpɜːrfɪkt/

(also past perfect, the past perfect tense)

[singular] (grammar语法)

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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Topics Languagec2
Word Originlate 15th cent.: from modern Latin plusperfectum, from Latin (tempus praeteritum) plus quam perfectum ‘(past tense) more than perfect’.