Past Perfect Tense
Past Perfect Tense is used to describes that one action was completed before another took place.
We use had + past participle of a verb for making sentences.
subject + had + 3rd form of the verb + object
Affirmative Sentences:
When we arrived, the game had started.
When she came, they had slept.
She lost so much weight because she had begun exercise.
He had studied English before he moved to London.
Negative Sentences:
subject + had not + 3rd form of the verb + object
It had not rained last month.
She had not finished her work last week.
They had not eaten at that café before today.
Interrogative Sentences:
Had + subject + 3rd form of the verb + object
Had you completed your homework?
Had you called your sister?