Past perfect - 1

The Past Perfect tells us about something that happened before another action in the past.
It can also show that something happened before a specific time in the past (putting emphasis only on the fact, not the duration).
For example:

• I had never seen such a high mountain before I went to Switzerland.
• I did not have any money because I had lost my purse.

For regular verbs, in the past perfect simple you use a form of 'have' and add “ed” behind the verb.
For irregular verbs, use the past participle form.
See a list of irregular verbs in this link (the third column): irregular verbs

See the next page for examples.