1. She said nothing so as not to wake the baby up.
2. I will write to Mai sao as to invite her over on my birthday party.
3. I'm learning English in order to read books in English.
4. Nam does morning exercises regularly so as to keep fit.
5. You should practice speaking English every day in order to improve it rapidly.
6. Mrs. Hoan gave up the job so that she could have more time with her children.
7. You have to wear warm clothes so as not to catch a cold.
8. He buried up to the station in order not to miss the train.
9. He locked the door so that no one could disturb him.
10. Mr. Tan saves money so that he can buy a new house.