$\text{Chào buổi sáng nha <3}$

1 . She didn't stop learning German until the age of 24.

=> It wasn't until the age of 24 that she stopped learning German 

2 . We didn’t find out about the meeting until he phoned us.

=> It wasn't until he phoned us that we found out about the meeting

3 . I didn’t know how to ride a bicycle until I was 15.

=> It wasn't until I was 15 that I knew how to ride a bicycle 

4 . I didn’t get up until half-past ten. 

=> It wasn't until half-past ten that I got up 

5 . He didn’t have enough money unitl he got a part-time job.

=> It wasn't until he got a part-time job that he had enough money 

$\text{Chúc bạn 1 ngày vui vẻ <3}$

1. It was not until the age of 24 that she stopped learning German 

2. It was  not until he phoned us that we found out about the meeting 

3. It was not until I was 15 that I knew how to ride a bicycle 

4. It was not until half past ten that I got up 

5. It was not until he got a part-time job that he had enough money 

Chúc bạn học tốt !!!