Past Perfect

Past perfect tense 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 actionhappened.

Formula of Verbal Sentence
(+) SUBJECT + HAD + V3
(- )SUBJECT + HAD + NOT + V3
(?) HAD + SUBJECT + V3?



Example:
(+) She had slept when I came last night.
(- )She had not slept when I came last night.
(?) Had she slept when I came last night?

Formula of Nominal Sentence
(+) SUBJECT + HAD + BEEN+ NON VERB

(- )SUBJECT + HAD +NOT + BEEN+ NON VERB

(?) HAD + SUBJECT + BEEN+ NON VERB?



Example:
(+) I had been there when the accident hapenned.
(- )I had not been Three when the accident hapenned.
(? )Had had been there when the accident hapenned?