Ответ:
1. She met him while she traveled on a train.
2. While the woman getting off the bus, she fell down.
3. The theif broke into while we were sleeping.
4. John took a photo while I didn't look.
5. While my mum was working in the garden, she hurt her back.
6. We were living in Madrid when our old aunt died.
7. When I got up this morning, it rained heavily.
8. While my dad was brushing teeth, my mum fell asleep.
9. I saw a nightmare while I sleeped last night.
10. What hapenned in your drean when monster chased you?
Объяснение:
Если что, посмотри в инете, запрос "прошедшее время 2 раза в предложении". Возможно кое где в данном овтете может быть другая форма прошедшего, заодно и сама поймёшь)