past perfect noun
Learner's definition of PAST PERFECT
the past perfect
grammar
: the form of the verb that is used in referring to an action that was completed by a particular time in the past ◊ The past perfect in English is formed by using had and the past participle of a verb, as in “She had visited there once before.”过去完成时（英语中的过去完成时由had加动词的过去分词构成，如句子She had visited there once before）。