The Past Perfect tense in English is composed of two parts: the past tense of the verb to have (had) + the past participle of the main verb.

[had + past participle]

Examples:
 
  • You had studied English before you moved to New York. 
  • Had you studied English before you moved to New York?
  • You had not studied English before you  moved to New York.


USE : Completed Action Before Something in the Past

The Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past.


 Examples:
  • I had never seen such a beautiful beach  before I went to Bali.
     
  • I did not have any money because I had lost my wallet.
     
  • Tony knew Kuala Lumpur so well because he had visited  the city several times.
     
  • Had Susan ever studied Thai before she moved to Thailand?
     
  • She only understood the movie because she had read the book.
     
  • Kristine had never been to an opera  before last night.
     
  • We were not able to get a hotel room because we had  not booked in advance.

Other Examples:

Positive                                 Negative                                               Question
I had finished                   I had not finished                          Had I finished?
You had finished.              You had not finished.                     Had you finished?