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Past-perfect tense verbs express actions that began and ended in the past like simple past tense verbs do. However,
the past perfect tense indicates that an
action ended before another past action.
The past perfect tense is created with the
auxiliary verb had plus a past participle.
Theo sold all the jewelry that he had made.
(The past participle indicates that Theo made the jewelery before he sold it.)
Ivan and Crystal had known about the problem for a long time before they
called an electrician.
(The past participle indicates that they knew about the problem before they called a plumber.)
I had seen the movie six times when I lost the dvd.
(The past participle indicates that I saw the movie before I lost the dvd.)
Countless people had died of infection before doctors began using soap.