Question

Hawking poured himself into his work and research. Change into past perfect tense.

Answer 1

Hawking had poured himself into his work and research.

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Answer 2

Hawking had  poured himself into his work  before his research.The Past Perfect Tense defines something that took place in the past before another action happened before To mention in other way, this signifies completion of certain event that happened prior to another past event.

The past is described with perfection when we always refer to a time earlier than prior to recent time. Although it is complicated it is really quite simple.

Example :The car had left before we reached the car park. Perhaps occurrence of both the events are in past,but the event car left happened before the event of our reaching the car park.