Pluperfect
tense

The pluperfect (shortening of plusquamperfect), usually called past perfect in English, characterizes certain verb forms and grammatical tenses involving an action from an antecedent point in time. Examples in English are: "we had arrived" before the game began; "they had been writing" when the bell rang.
The word is derived from the Latin plus quam perfectum, "more than perfect". The word "perfect" in this sense means "completed"; it contrasts with the "imperfect", which denotes uncompleted actions or states.
In English grammar, the pluperfect (e.g. "had written") is now usually called the past perfect, since it combines past tense with perfect aspect. (The same term is sometimes used in relation to the grammar of other languages.) English also has a past perfect progressive (or past perfect continuous) form: "had been writing".
Meaning of the pluperfect
The pluperfect is traditionally described as a tense; in modern linguistic terminology it may be said to combine tense with grammatical aspect; namely past tense (reference to past time) and perfect aspect. It is used to refer to an occurrence that at a past time had already been started (but not necessarily completed), (e.g. "It had already been raining for a week when the big storm started.").
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This entry incorporates text from “Pluperfect” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.