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1. Not having a boyfriend, she flirted with every guy she met.
2. Not having been there before, he was stunned.
3. Before leaving the house, he switched off the lights.
4. Being on holiday, she couldn't go to the party.
5. While preparing dinner, she cut her finger.
6. When travelling around Ireland, I always stay in youth hostels.
7. Not hearing the doorbell, she missed the delivery.
8. Having dropped him at the station, I drove straight to the supermarket.
9. Not feeling well, he stayed in bed.
10. While talking on the phone, they forgot everything around them.