1. If the work is finished by lunchtime, you can go home.
--> Get the work finished by lunch time and you can go home.
2. They left quitely so that they wouldn't wake the baby up.
--> So as not to wake the baby up, they left quitely.
3. All the rivers in the region were so poisonous that no fish could live in.
--> So poisonous were all the rivers in the region that no fish could live in.
4. The number of tourist visiting this area rose last year.
--> There was a rise in the number of tourist visiting this area last year.
5. The national museum is the same as it was 30 years ago.
--> The national museum has samed it for 30 years.