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 I had never seen such a beautiful beach before I went to Kauai.
 I did not have any money because I had lost my wallet.
 Tony knew Istanbul 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.
 A: Had you ever visited the U.S. before your trip in 2006?
B: Yes, I had been to the U.S. once before.

USE 2 Duration Before Something in the Past (Non-Continuous Verbs)

With non-continuous verbs and some non-continuous uses of mixed verbs, we use the past
perfect to show that something started in the past and continued up until another action in the
past.

Examples:

 We had had that car for ten years before it broke down.
 By the time Alex finished his studies, he had been in London for over eight years.
 They felt bad about selling the house because they had owned it for more than forty
years.

Although the above use of past perfect is normally limited to non-continuous verbs and
non-continuous uses of mixed verbs, the words "live," "work," "teach," and "study" are
sometimes used in this way even though they are NOT non-continuous verbs.

PRESENT PERFECT TENSE: