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Past Perfect
Past Perfect [S + had + v3 + o]
The Past Perfect is used to indicate
1. An action that happend before another action in the sentece
•    John had gone to the store before he went home.
•    Jack told us yesterday that he had visited England in 1970.
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| S + had + v3 + before + S + v2 |
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•    John went home after he had gonae to the store.
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| S + v2 + after + S + had + v3 |
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•    Before John went home, he had gone to the store.
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| before + S + v2 + S + had + v3 |
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2. A state which continued for a time in the post, but stopped before now.
- Abdu had lived in new york for ten years before he moved to california
1.    Past perfect progressive (continous for category 2 of past perfect only, we can use the past perfect continous).
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| S + had + been + v ing + ... |
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Abdu had been living in New York for ten years before he moved to california.

exam ::
1.    The Policeman read the suspect his right after he had arresting (arrest) him.
2.    After John had washed (wash) his clothes, he began to study.
3.    George had waited (wait) for one hour before the bus come.
4.    Maria enter (enter) the university after she had graduate from the community college.
5.    Jeannette wash (wash) the pipettes after she had completed the experiment.
6.    Jane sent a letter to her university after she had reiceved (reiceve) her scholarship check.
7.    After the stewardesses had served lunch to the passangers, they sat (sit) down.
8.    The car had been flipping (flip) ten times before it landed on its roof.
9.    We corrected our papers after we had taken (take) the quiz.
10.    John had lived (live) in Miami for one year went his parents come to visit.