* Rewrite the sentences, using perfect gerunds or perfect participles 10. Since Huong had refused Linh's offer of a lift in his car, hshe had to walk home. --> 11. Thanh had forgotten to turn off the gas cooker before he left his house. He admitted that. --> 12. After we have planned the content we're now looking for supporting information --> 13. Mai had not learned hard. She regretted it --> 14. Since humans have treated the environment irresponsibly, they now have to suffer. --> 15. Hieu had broken this vase.He admitted that. -->

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10 . Since Huong had refused Linh's offer of a lift in his car, hshe had to walk home.

=> Having refused  Linh's offer of a lift in his car, Huong had to walk home.

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

=>Thanh admitted having forgotten to turn off the gas cooker before leaving the house.

12 . After we have planned the content we're now looking for supporting information

=> Having planned the content, we're now looking for supporting information.

13 . Mai had not learned hard. She regretted it

=>Having treated the environment irresponsibly, humans now have to suffer.

14 . Since humans have treated the environment irresponsibly, they now have to suffer.

=> Having treated the environment irresponsibly, humans now have to suffer.

15 .Hieu had broken this vase.He admitted that. 

=> Hieu admitted having broken this vase.