Simple past Vs Past perfect

1. When I …………………… (arrive) at the station, the train ……………………

(already, leave).

• When I arrived at the station, the train had left.

• When I arrived at the station, the train had already left.

We …………………… (thank) the couple for everything they …………………… (do) to help save our daughter.

• We had thanked the couple for everything they had done to help save our daughter.

• We thanked the couple for everything they had done to help save our daughter.

As soon as I …………………… (hear) the voice, I …………………… (realize) I …………………… (meet) the person before.

• As soon as I heard the voice, I realized I had met the person before.

• As soon as I had heard the voice, I realized I met the person before.

I …………………… (go) to the shop to buy the shirt I (see) the day before.

• I had gone to the shop to buy the shirt I saw the day before.

• I went to the shop to buy the shirt I had seen the day before.

I ………………… (return) the book when I..................... (finish) reading it.

• I had returned the book when I finished reading it.

• I returned the book when I had finished reading it.

I …………………… (not go) to bed until the film............................. (finish).

• I didn't go to bed until the film had finished.

• I didn't had gone to bed until the film had finished.

The test …………………… (be) difficult because I............ (not study).

• The test was difficult because I hadn't studied.

• The test had been difficult because I didn´t studied.

He …………………… (run) the company for over forty years when he ...................... (retire).

• He had run the company for over forty years when he retired.

• He had ran the company for over forty years when he retired.

She still ……………………(not finish) her assignment when I last ................... (speak) to her.

• She still hadn´t finished her assignment when I last spoke to her.

• She still hadn´t finish her assignment when I last spoke to her.

Our exam results …………………… (be) much better than we …………………… (expect).

• Our exam results had been much better than we had expected.

• Our exam results were much better than we had expected.