Affirmative
When I arrived at school / the class / start
The class had started when I arrived at school.
When the bell rang / she / finish the test
She had not finished the test when the bell rang.
you / finish homework / before the teacher collected it
Had you finished your homework before the teacher collected it?
When we got to the station / the train / leave
The train had left when we got to the station.
When the movie began / they / eat dinner
They had not eaten dinner when the movie began.
they / see that movie / before it came to Netflix
Had they seen that movie before it came to Netflix?
When the police arrived / the thief / escape
The thief had escaped when the police arrived.
When the teacher checked / the students / complete the exercise
The students had not completed the exercise when the teacher checked.
she / read the book / before she watched the movie
Had she read the book before she watched the movie?
When I called him / he / leave the house
He had left the house when I called him.
When we arrived at the restaurant / they / order the food
They had not ordered the food when we arrived at the restaurant.
they / meet the new teacher / before the class started
Had they met the new teacher before the class started?