Odpowiedź:
1.1.I was travelling on the bus when I loose my bag.
1.2. I loose my bag while I was travelling on the bus.
2.1. The burglar was jumping out of a window when he hurt his leg.
2.2. The burglar hurt his leg while he was jumping out of a window.
3.1. the vandals were walking down the street when they damaged a car.
3.2. the vandals damaged a car while they were walking down the street.