1 When I arrived at school, the lesson had begun.

2 As soon as he had explained it to me, I understood how it worked.

3 The Russian Federation was formerly known as the Soviet Union.

4 He was lying in hospital with a broken leg. Two hours earlier he had been skiing.

5 While I was having a shower, the phone rang.

6 I was having a shower in the meantime the phone suddenly rang.

7 Throughout the lesson, I listened to my Walkman.

8 When I'm rich, I'll buy a Ferrari. Meanwhile, I'll continue to drive my old Fiat.

9 Following the earthquake, thousands of people were homeless.

10 Once the singer walked onto the stage, everyone started clapping and cheering.

11 During the past few weeks, I've learned a lot of vocabulary.

12 Back in the 1980s, very few people owned computers.

13 I've loved her ever since I first saw her.