Công thức: S + used to + V: đã từng làm gì

                         not used to + V: chưa từng làm gì

1. They no longer go jogging.

⇒ They used to go jogging.

2. He was a good student in the past.

⇒ He used to be a good student.

3. He got up early in the morning but now he doesn't it.

⇒ He used to get up early in the morning.

4. She doesn't go to the supermarket once a week any more.

⇒ She used to go to the supermaket once a week.

5. Jane doesn't work for the telephone company any longer.

⇒ Jane used to work for the telephone company.

6. Jim was my best friend, but we aren't friends any more

⇒ Jim used to be my best friend.

7. I didn't eat ice-cream when I was child.

⇒ I didn't use to eat ice-cream.

8. I didn't drink coffee when I was young.

⇒ I didn't use to drink coffee