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2 I didn't meet my old friend while I was staying in Prague I was staying in Prague when I didn't meet my old friend 3 I walked into a tree while she was talking... She was talking...when I walked into a tree 4 I was shopping when he lost his wallet He lost his wallet while I was shopping 5 I was doing the washing-up when I broke a glass I broke a glass while I was doing... 6 I was driving home when they run out of petrol They run out of petrol while I was driving... 7 I broke the key while he was trying to open the door He was trying...when I broke the key 8 I wasn't swimming when we heard the screams We heard the screams while I wasn't swimming.