1. Scientists are working with stem cells. Stem cells will revolutionize medicine.
2. Last week, Jim Taylor interviewed Sally Thomson. She is my neighbor.
3. Mr. Brown has been invited to join our club. He enjoys going to the theatre.
4. Whiting House is an important local monument. It was built in 1856.
5. Bono signed autographs at Tower Records yesterday. He's a famous musician.
6. John F. Kennedy was assassinated in 1963. He was President of the USA.
7. The Queen will open a new hospital. It is on Jarvis Street.

 

Here are the sentences rewritten using the provided time-related expressions:

4. By the time scientists are working with stem cells, stem cells will revolutionize medicine.

5. As soon as Jim Taylor interviewed Sally Thomson last week, he found out she is my neighbor.

6. Mr. Brown has been invited to join our club since he enjoys going to the theatre.

7. Whiting House, which was built in 1856, is an important local monument.

8. Yesterday, Bono, a famous musician, signed autographs at Tower Records.

9. Until 1963, John F. Kennedy was president of the USA before he was assassinated.

10. Before the Queen opens a new hospital in Jarvis Street, preparations have been made.