The past perfect tense uses the helping verb "had" plus the past participle to describe an action that was completed before another past action. It is used to talk about something that happened before another event in the past. Examples are provided where "had gone" and "had already seen" describe actions completed before other past events mentioned in the sentences. A question and negative example are also given to illustrate the use of the past perfect tense.

1. THE PAST PERFECT

2. HAD + PAST PARTICIPLE
• An action which happened before another
past action.
Example:
- When I arrived at the party, Tom wasn´t there. He
had gone home.
- I didn’t go to the cinema because I had already seen
the film.

3. • QUESTION:
Had the film finished when the light went off?

4. • NEGATIVE:
I hadn’t finished my homework when the
computer stopped working