The Past Perfect tense in quite easy to use and understand.We normally using this tense to show that one action happened in the past before another action.
WE are using this tense to
1.to completed the action before another activity in the past.
2.Third conditional tense.
3.Dissatisfaction with past.
The past perfect is also used i number of methodsn like this,
i wish,if/though and if only.
This tense is having the following format.
subject+Auxilary verb(have) conjugated in simple past.+main verb past participle.
example:
I had finished my work.
our had finished before me.
She had gone not go to school.
Example for Action followed by one another..
When we arrived ,The train had already left.
By the time i watched the movie ,i had eaten sweets.
When i got to the market,Most of the shop had already been closed.
I had read the document before i signed it.