COMPUTER SCIENCE AND ENGINEERING
UNIX
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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We use it when there is only 1 event.
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Had + P.P
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We use it when events happened at the same time.
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Have + P.P
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Detailed explanation-1: -The past perfect is made from the verb had and the past participle of a verb: I had finished the work. She had gone.
Detailed explanation-2: -The past perfect refers to a time earlier than before now. It is used to make it clear that one event happened before another in the past. It does not matter which event is mentioned first-the tense makes it clear which one happened first.
Detailed explanation-3: -The past perfect form of have is had had (had + past participle form of have). The past perfect tense is used when we are talking about the past and want to refer back to an earlier past time. She felt marvelous after she had had a good night’s sleep.
Detailed explanation-4: -We use the past perfect simple (had + past participle) to talk about time up to a certain point in the past. She’d published her first poem by the time she was eight. We’d finished all the water before we were halfway up the mountain. Had the parcel arrived when you called yesterday?