past perfect - significado y definición. Qué es past perfect
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Qué (quién) es past perfect - definición

TENSE
Past perfect; Plusquamperfect tense; Plusquamperfect; Past perfect tense; Past Perfect; Plu-perfect; Plu perfect tense; Past perfect simple; Simple past perfect; Past perfect simple continuous; Pluperfect tense; Plus quam perfectum; Plus-que-parfait; Plus que parfait; Past anterior

past perfect         
¦ adjective &noun another term for pluperfect.
past perfect         
In grammar, the past perfect tenses of a verb are the ones used to talk about things that happened before a specific time. The simple past perfect tense uses 'had' and the past participle of the verb, as in 'She had seen him before'. It is sometimes called the pluperfect
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ADJ: ADJ n
pluperfect         
The pluperfect is the same as the past perfect
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N-SING: the N

Wikipedia

Pluperfect

The pluperfect (shortening of plusquamperfect), usually called past perfect in English, is a type of verb form, generally treated as a grammatical tense in certain languages, relating to an action that occurred prior to an aforementioned time in the past. Examples in English are: "we had arrived"; "they had written".

The word derives 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".

Ejemplos de pronunciación para past perfect
1. So the most difficult thing for Chinese is past perfect tense,
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