Question

[Trọng Thanh]

27. They came home, I finished.

=> Before..

28. Before I arrived, Jack had left the office

=>

 John went to bed after he had finished the report.

=> Before 

30. Steven bought a new motorbike, but fist he saved enough money.

→ After...

Answer 1

[Minh Khanh]

27.Before they came home,I had finished

28.After Jack had left the office,I arrived

29.Before jonh went to bed,he had finished the report

30.After Steven had saved enough money, he bought a new motorbike