Past perfect continuous: show an activity before another past event

The past perfect continuous needs a past reference point. From that point, you look further back to an activity that had already been continuing. The activity may still have been happening at that moment, or it may have stopped shortly before it.

By the time the shop opened, people had been waiting outside for thirty minutes.

Opening the shop is the later past point. Waiting began earlier and continued until then.

People waited outside after the shop opened.

This sentence changes the order. The waiting happened later, after the shop opened.

Which action started first: waiting outside or opening the shop?

Waiting outside started first, so had been waiting shows the earlier continuing activity.

Use had been for every subject, then add the -ing form of the main verb. The form does not change with I, she, or they. Do not use had was or had were in this tense.

We had been preparing the room before the guests arrived.

Had been preparing is the complete verb phrase. Preparing is the -ing form after been.

She had been writing notes before the call started.

Writing follows had been. Do not say she had been wrote notes.

Complete the sentence: He had been ____ for the interview. Choose practise or practising.

Use practising. The main verb after had been needs the -ing form.

Use for to name the length of an activity and since to name its starting point. These words help the listener see how long the activity had continued before the past reference time.

Mina had been working on the report for two days before she sent it.

For two days gives the length of the work before the report was sent.

Mina had been working on the report since Tuesday before she sent it.

Since Tuesday gives the starting point of the work before the later sending.

Choose the time phrase for a length: for three weeks or since three weeks?

Use for three weeks. Use since with a starting point, such as since July.

The tense can explain why someone or something had a condition at a past moment. The earlier activity is often the cause, while the simple-past clause gives the result you could see or feel.

Her hands were cold because she had been washing the car.

The washing activity happened before the cold hands were noticed and explains their condition.

His eyes were tired because he had been reading on a small screen.

The reading was an earlier ongoing activity. The tired eyes are the later past result.

Choose the better explanation for a tired runner: She had been running, or She had run five kilometers?

Both can be correct, but had been running emphasizes the ongoing activity that explains her condition.

Put not after had to make a negative. Move had before the subject to make a question. Keep been and the -ing form in both patterns.

We had not been using the new system before the training session.

Had not been using says that the activity did not continue before the training session.

Had the team been discussing the plan before the meeting?

Had moves before the subject to ask about an earlier ongoing discussion.

Turn this into a question: You had been waiting since noon.

Had you been waiting since noon?

Use the past perfect simple when the completed action or its result is the main point. Use the past perfect continuous when you want to stress the activity, its duration, or the cause of a past result. Both tenses can describe events before another past time, but they focus on different parts of the situation.

The chef had prepared six dishes before the event began.

Had prepared focuses on the completed number of dishes.

The chef had been preparing food since dawn before the event began.

Had been preparing focuses on the continuing work and its duration.

Which form fits a completed count: They had been writing five emails, or They had written five emails?

Use They had written five emails because the sentence gives a completed number of emails.