1. The last time Henry smoked a cigarette was in 2005.

=> Henry hasn't smoked a cigarette since 2005.

2. Jack is being stopped by the police because he passed the speed limit.

=> If Jack had passed the speed limit, he wouldn't be (being) stopped by the police.

3. Bill and Peter are too young to ride motocycles. 

=> Bill and Peter are not old enough to ride motocycles.

4. The flood was so high that they had to live on the roofs.

=> It was such a high flood that they had yo live on the roofs. 

5. This winter is colder than the last winter.

=> The last winter isn't so cold as this winter.

6. David has read a lot of books but he cannot find a good solution. 

=> Although David has read a lot of books, he cannot find a good solution. 

7. People think that doing morning excercises is good for their health. 

=> Doing morning exercies is thought to be good for people's health.

8.Follow the instructions carefully and you won't have any problems . 

=> As long as you follow the instructions carefully, you won't have any problems.

9. "I'm sorry, I gave you the wrong number," said Paul to Susan. 

=> Paul apologized to Susan for giving her the wrong number.

10. The garage is servicing my car on Monday. 

=> I am having the garage service my car on Monday.

Hoặc: I am having my car serviced by the garage on Monday.