Past Perfect Tense

Rumusnya yaitu :
(+) S+had+V3+O
(- )S+had+not+V3+O
(?) Had+S+V3+O

Example:
(+) Andi had studied english by 7 o'clock yesterday last night.
(- ) Andi had not studied english by 7 o'clock yesterday last night.
(?) Had Andi studied english by 7 o'clock yesterday last night?

Pada Past Perfect biasanya terdiri dari 2 kata yang biasanya menggunakan kata sambung before,after,when (didepan/ditengah),because,as soon as(ditengah).