Is a kind of tense that is used to describe an action or an event that started in a certain time in the past and completed of finished certain time in the past too ; or past perfect tense is used to express an action or an event that had happened before that other event or action happened.
Formula of Verbal sentence :
(+) Subject + had + V3
(- ) Subject + had + not + V3
(?) Had + Subject + V3
E.g : (+) She had put my book on the table last night
(- ) She had not put my book on the table last night
(?) Had she put my book on the table last night ?
Formula of Nominal Sentence
(+) S + Had + Been + Non Verb
(- ) S + Had + Not + Been + Non Verb
(?) Had + S + Been + Non Verb ?
E.g : (+) I had been there when the accident happened
(- ) I had not been there when the accident happened
(?) Had been there when the accident happened ?
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