What is Past perfect tense?

The PAST PERFECT TENSE denotes that an action was completed (finished or 'perfected') at some point in the past before something else happened. This tense is consisted with the past tense form of 'to have' (HAD) plus the past participle of the verb (which can be either regular or irregular in form).

*The Past perfect tense describes an action completed before a certain moment in the past; as,

I met him in New Delhi in 1999.I had seen him last five years before.

*If two actions happened in the past, it may be necessary to show which action happened earlier than the other. The Past perfect is mainly used in such situations. The Simple Past is used in one clause and the Past perfect in the other as;

When I reached the station the train had started. (So I couldn’t get into the train)

I had done my exercise when Hari came to see me.

I had written the letter before he arrived.

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