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The past perfect progressive or past perfect continuous (also known as the pluperfect progressive or pluperfect continuous) combines perfect progressive aspect with past tense. It is formed by combining had (the past tense of auxiliary have), been (the past participle of be), and the present participle of the main verb.
In perfect progressive (or perfect continuous) constructions, the perfect auxiliary (a form of have) is followed by the past participle been (from be, the auxiliary of the progressive aspect), which in turn is followed by the present participle of the main verb. As before, the perfect auxiliary can appear in various tenses, moods and non-finite ...
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".
For example, the verb write has the principal parts write (base form), wrote (past), and written (past participle); the remaining inflected forms (writes, writing) are derived regularly from the base form. Some irregular verbs have identical past tense and past participle forms (as the regular verbs do), as with send–sent–sent.
There is a perfect form in both tenses, which is expressed by an inflected form of the imperfective auxiliary verb έχω "have" and an invariant verb form derived from the perfective stem of the main verb. The perfect form is much rarer than in English. The non-past perfect form is a true perfect aspect as in English.
The passive voice is formed using the verb be (in the appropriate tense or form) with the past participle of the verb in question: cars are driven, he was killed, I am being tickled, it is nice to be pampered, etc. The performer of the action may be introduced in a prepositional phrase with by (as in they were killed by the invaders).
French expresses past counterfactual conditional sentences in exactly the same way as English does: the if clause uses the had + past participle form, while the then clause uses the would have + past participle form, where the equivalent of would have is the conditional of the auxiliary (avoir or être) used in all perfect constructions for the verb in question.
It is a past tense that indicates an action taken once in the past that was completed at some point in the past (translated: "<verb>ed"). This is as opposed to the imperfect (l'imparfait), used in expressing repeated, continual, or habitual past actions (often corresponding to English's past continuous was/were <verb>ing or habitual used to ...