giúp mình với

1. There was a secondary school here in the 1900s.

  → There used to be a secondary school here in the 1900s.

2. We didn’t get up early to catch the bus several years ago.

  → We didn’t use to get up early to catch the bus several years ago.

3. He didn’t know how to study English online, but now he can study well.

  → He didn’t use to know how to study English online, but now he can study well. 

4. We often played hide and seek when we were children. 

  → We used to play hide and seek when we were children.