Use of Past Perfect. Past Perfect Simple is used for actions taking place before a certain time in the past. Examples: I had typed five pages when my computer suddenly crashed. Before 2002, I had not worked abroad. Signal Words of Past Perfect. already, just, never, not yet, once, until that day, If Clause Type III (If I had talked, …)
The past perfect tense is a verb tense used to indicate that an action took place before another action in the past. For example, you might use the past perfect tense to say “I had already eaten lunch by the time my friends arrived.” The past perfect tense is formed by using the auxiliary verb “had” and the participle form of the main verb.
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by the time past perfect examples