1. john  walked to school , but now he doesn't . 
=> John used to walk to school
2, marry was a good singed when she was young . 
=> marry used to be a good singer when ...
3, there were alot of trees in front ò my house. 
=> there used to a lot of....
4, mary speaks english fluenthy 
=> mary is a fluent English speaker
my class mate was avery harnt leamer ( ko hiểu câu này có ý gì )
=> my class mate 
6, they are going to build a new shopping centre here. 
=> A new shopping center is going to be built here
7, they don't have to cut grass in the garen 
=> grass doesn't used to be cut in the garden

1. John used to walk to school.

2. Marry used to be a good singed when she was young .

3. There used to be a lot of trees in front of my house.

4. Mary is an English speaker.

5. My class mate learns very hard.

6. A new shopping center is going to be built here.

7. Grass doesn't used to be cut in the garden.