1. Jane didn’t know how to swim until she was 15 years old. =

2. Lisa promised to come at eleven o’clock, but she showed up at half past eleven.

3. I couldn’t finish my homework until Jenny helped me. =

4. John wasn’t allowed to open his presents until his birthday. =

5. I don’t have to wear my uniform until I go to school. =

6. It is not until John's alarm clock goes off that he wakes up. =

7. ​​Anna was unable to take up the post until the following year. =

8. My brother didn’t do his homework until his teacher came back.

9. No one could leave the school until 14:30.

10. Jane didn’t finish her Math exercises until yesterday.