Bài tập cấu trúc it was not until 3

    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.