1. We didn't used to have a colorful TV,but we do now.

Sửa: used -> use

2. When my baby sister is younger, she didn't use to eat pizza.

Sửa: is -> was

3. It's about 500 meters at my house to school.

Sửa: at -> from

4. What about go to the park on foot? - it is a good idea.

Sửa: go -> going

5. Did he use to crying all night when his father died?

Sửa: crying -> cry

1. We didn't used to have a colorful TV, but we do now.  → use `-` Thì quá khứ đơn câu phủ định: S + didn't + Vinf

2. When my baby sister is younger, she didn't use to eat pizza. → was `-` Used to diễn tả thói quen trong quá khứ không liên quan đến hiện tại

3. It's about 500 meters at my house to school. → from `-` It is about + khoảng cách + from A to B

4. What about go to the park on foot?`-` It is a good idea. → going `-` What about + Ving

5. Did he use to crying all night when his father died? → cry `-` Used to + Vinf