Past Perfect Tense

 Fungtion              : To express an activity at the past that was done where there was something happened.

Pattern

(+)          Subject + Had + Verb₃ + Complement.

(–)          Subject + Had + Not + Verb₃ + Complement.

(?)          Had + Subject + Verb₃ + Complement?

(_WH)      WH + Had + Subject + Verb₃ + Complement?

*When/Before – Simple Past, – Past Perfect.

*Past Perfect – When/Before – Simple Past.

*After/Because/As Soon As – Past Perfect, – Simple Past.

*Simple Past – After/Because/As Soon As – Past Perfect.

#Example            :

(+) Frida had eaten before she went to her school.

(–) Frida had not eaten before she went to her school.

(?) Had Frida eaten before she went to her school?