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.