The past perfect is similar to the present perfect, but it is used
differently.

STRUCTURE

To form the past perfect, use this structure:

Subject + Had + Past Participle

Here are some examples:

I had tried sushi before I went to Japan.
I had done my homework already.

The past perfect always uses "had", which is the verb "have"
in the past. It is common to use a contraction with "had":

USES

Actions in the past that happen before another action. The
1st action is in past perfect and the second action is in
simple past.

Take a look at this situation and how past perfect is used:

7:00        I ate dinner.
9:00        She invited me to a restaurant.

She invited me to a restaurant but I had eaten dinner.

Here are some examples of the past perfect:

I had never been to his house before I went to his party.
I arrived at the station at 9:00 am, but the train had left.
I had not met his girlfriend before.
He had not studied English before he came to Canada.

Past Perfect and Present Perfect

Past perfect is present perfect in the past. Look at the
example to understand how past perfect works the same as
present perfect.

(Monday)

Tom: Would you like to go out for dinner?
Jane: No. I have already eaten dinner. (Present Perfect)

(Tuesday)

Kim: Did you go out for dinner with Jane?
Tom: No. I invited her to dinner, but she had already eaten.

This means the words that are common with present perfect
can also be used in the past. These include ALREADY, YET,
STILL, SINCE, and FOR.

My teacher asked me for my project, but I had not
finished it yet.
He introduced me to his father, and I realized had already
met him.
I ate a lot of food last night for dinner, because I hadn't
eaten anything since breakfast.
I had not seen my sister for 3 months.

Practice Past Perfect with these tests:

Past Perfect Test

Past Perfect Test 2

I'd	You'd
He'd	It'd
We'd	They'd