1. Toan loved playing badminton when he was small. 

Toan used to play badminton when he was small.

2. She went to school on foot when she was 15 years old.

 She used to go to school on foot when she was 15 years old.

3. My hair was long and black 5 years ago. Now it’s short and yellow.

My hair used to be long and black 5 years ago.

4. His father was a teacher in our school. Now he is retired.

His father used to be a teacher in our school.

5. Folk songs were so popular in the past. Now they aren’t anymore.

Folk songs used to be so popular in the past.

6. There was less traffic congestion 10 years ago. Now it becomes more common.

There used to be less traffic congestion 10 years ago.

7. My grandmother was the prettiest girl in the village. 

My grandmother used to be the prettiest girl in the village.

8. My room was blue last year. Now I’ve painted it pink. 

My room used to be blue last year.

9. This singer had little money when she was small.

This singer used to have little money when she was small.

10. People wrote letters to each other. Now they have mobile phones.

People used to write letters to each other.