1. Since having used too much chemical fertilizer on their farm, the farmers now have to drink polluted water.
2. After having replaced all the light bulbs in her house with LED lights, she saved a lot of money on her electricity bills.
3. Since having become too dependent on the use of electricity, we have to find alternative sources of energy before fossil fuels run out.
4. Sam regretted not having worked hard enough in his previous job.
5. People admired Tom for having rescued the kids from the fire
6. I remember that not having seen him before.