Past Perfect
A few days ago, I was invited to my friend’s birthday party. He told me that the party would start at 8. However, I arrived there at 10! Unfortunately, some of the guests had left already. So, I couldn’t see some of the friends that I hadn’t seen for a long time.
As we can see, when Ryan arrived, his friends had left the party. This means that first his friends left the party, and then Ryan arrived. In the example above, arrived is past simple and had left is past perfect.
Forming Past Perfect Questions
Past perfect form of a verb is made in the following ways:
Positive form: had + past participle (P.P)
Negative Form: had not + past participle (P.P) OR hadn’t + past participle (P.P)
Question Form: (wh.-word) + had + subject + past participle (P.P)
☑ I had called John before I left the office.
☑ When I finished college, I hadn’t started my job yet.
☑ Had you heard about her divorce from Jimmy?
☑ Where had you been before moving to Tokyo?
When to Use Past Perfect
I. When we are talking about a past action or situation, to mention something that happened even earlier than that, we use past perfect. In other words, when talking about two actions in the past, the one that occurs first (is far from now) can appear in past perfect form. The second action (the one that happens later) is expressed in the past simple.
☑ When we got to the cinema, the film had already started.

☑ I had been awake for some time when the alarm rang.

II. To say how long an action or situation continued before a certain point in the past, we use past perfect.
☑ Yesterday, I finally managed to make some time to visit some old friends I hadn’t seen for years.
☑ They had worked together for 10 years when, last year, they started their own company.
III. We use past perfect to talk about things that we hoped or wanted to do, but we did not actually do.
☑ She had hoped she would find a new flat in just a few weeks, but it took her over two months.
☑ We had expected to receive a promotion after all that pressure, but the company hardly acknowledged it.
Adverbs with Past Perfect
Note that sometimes we use an adverb with a past perfect verb. We usually put the adverb between “had” and the “past participle”.
☑ Billy came to tell me about the football match, but I had already heard about the result.
☑ Last summer, I visited the Grand Canyon. I had never seen such a beautiful view before that.
Past Perfect vs Simple Past
Note that to talk about a single action or event in the past, we DO NOT USE past perfect.
☑ She soon lost interest in academic work and left her position at university.
☑ The rain was so heavy that we had to cancel the trip.
Note that when we use a time conjunction like before, after, when, once, etc., to connect two past events or actions, we DO NOT NEED to mention the earlier action in past perfect. However, using a past perfect can emphasise that the two actions or events are separate and that one action finished before the other one started.
☑ He started to work as a teacher right after he finished college.
☑ I went to bed as soon as I arrived home.
☑ When she had saved enough money, she bought a camper van and started her journey around Europe. (to emphasise that saving money happened in a different time)
Note that to show that the second action or situation is the result of the first, we mention both actions or situations in past simple.
☑ As soon as he started to sing his famous song, the audience gave him a big round of applause.
☑ When he was injured for the third time, he decided to retire from the game.