Perfect and Gerund participle

They had hunted and killed many wild animals. Later they regretted what they had done.

After she replaced all the light bulbs in her house with LED lights, she saved a lot of money on her electricity bills.

Tonya had dumped a lot of rubbish on the beach. She was strongly criticized for that.

Since Mai had refused Nam's offer of a lift in his car, she had to walk home.

Tony had rescued the kids from the fire. People admired him for that.

He had dumped lots of rubbish onto the beach. He denied it.

'You've lied to us,' the villagers said. The politician denied it.

Thanh had forgotten to turn off the gas cooker before he left his house. He admitted that.

The factory had dumped tons of toxic waste into the river. It was heavily fined for that.

Since we have become too dependent on the use of electricity, we have to find alternative sources of energy before fossil fuels run out.

I have seen him before. I remember that.

Someone had cut down the oldest tree in the park. The police suspected Mike of doing it.

Since the farmers used too much chemical fertilizer on their farm, they now have to drink polluted water.

 After Ha had read some documents about Green Earth, she decided to join the organisation.

You had saved the lives of hundreds of wild animals. Thank you for that.

Sam had not worked hard enough in his previous job. He regretted it.

Denis had taken an active part in the Green Summer activities. He was rewarded for that.

After the students had learnt about the benefits of recycling and reusing, they started collecting waste paper, bottles, and cans to recycle and reuse.