1. When the bus arrived, we were talking/ We were talking when the bus arrived
2. Because we missed the bus, we were so late. / We were so late because we missed the bus
3. The tortoise was running while the hare was sleeping. /While the hare was sleeping, the tortoise was running
4. Although Tam worked hard, her stepmother wasn't satisfied.
5. If it costs too much money, we won't celebrate the festival.
6. While Paul was walking to the bus stop, he found someone’s wallet on the ground.
7. Most people book tickets long in advance otherwise they cannot return home for Tet.