Respuesta:
1. I was walking when I saw my friend.
2. While I ran, it started to snow.
3. I woke up late, so I missed the bus.
4. I can't open the door because I lost my keys.
5. I nearly forgotten my passport, but luckily the taxi driver reminded me to check.
6. I saw her at her wedding and realized I was going to school with her.
7. I made a cup of tea when I remembered that I hadn't bought any milk.
