V4 U3 Past Perfect Tense vs Simple Past Tense

Front

When I came back from school, my mother (tidy) my room.

Back

had tidied

Front

When he (arrive) at the station, he found that the train had left.

Back

arrived

Front

Maria did not go to the supermarket because she (lose) her purse.

Back

had lost

Front

When I (wake up), I noticed that my brother had gone out.

Back

woke up

Front

Tom's father was happy with him because he (get) good marks at school.

Back

had got

Front

When the doctor arrived at last, the patient (already/ die).

Back

had already died

Front

He recognized his penpal easily because he (see) his photo before.

Back

had seen

Front

After the group London, they to Edinburgh. (leave/ fly)

Back

had left, flew

Front

When the friends.... to the cinema, the film ..... (to get/to start)

Back

got, had already started

Front

Before the students ...... the test they ........off their mobiles. (to start/to switch)

Back

started, had switched