7 We had worked in the garden all day and were sunburned in the evening.
→ Having worked in the garden all day we were sunburned in the evening.
8 She had not slept for two days and therefore wasn't able to concentrate.
→ Not having slept for two days she wasn't able to concentrate
9 Since I had not seen him for ages, I didn't recognize him.
→ Not having seen him for ages I didn't recognize him