1.I cought that cold when I was skating on a frosty day
2 He wrote those nice poems when he was having a holiday
3 She learnt the language when she was livinf in England
4 She heard that song whe she was listening to a concert on the radio
5 I bought that book when I was reading up for my exams
6 The boy hurted himself when he was riding the bicycle
7 Philip lost his camera when he was walking the city
8 He rang you up when he was having supper