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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.
The non-past perfect form is a true perfect aspect as in English. In addition, all the basic forms (past and non-past, imperfective and perfective) can be combined with a particle indicating future tense/conditional mood. Combined with the non-past forms, this expresses an imperfective future and a perfective future.
In a November 2006 Vanity Fair article, Richard Perle used the phrase to refer to the Iraq War, claiming that "mistakes were made, and I want to be very clear on this: They were not made by neoconservatives, who had almost no voice in what happened, and certainly almost no voice in what happened after the downfall of the regime in Baghdad." [16]
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 ...
Resultative perfect (referring to a state in the present which is the result or endpoint of an event in the past): "I have lost my pen-knife" (message: I still don't have it) Continuative perfect (past situations continuing into present): "I have always guided him" Anterior perfect (completed past situations, but with relevance to the present):
The base form or plain form of an English verb is not marked by any inflectional ending.. Certain derivational suffixes are frequently used to form verbs, such as -en (sharpen), -ate (formulate), -fy (electrify), and -ise/ize (realise/realize), but verbs with those suffixes are nonetheless considered to be base-form verbs.
Regular verbs have identical past tense and past participle forms in -ed, but there are 100 or so irregular English verbs with different forms (see list). The verbs have, do and say also have irregular third-person present tense forms (has, does /dʌz/, says /sɛz/).
Proto-Indo-European verbs reflect a complex system of morphology, more complicated than the substantive, with verbs categorized according to their aspect [a], using multiple grammatical moods and voices, and being conjugated according to person, number and tense.