Ребята, Пожалуйста посчитайте пожалуйста с английским​

2 I used to study Japanese

3 I didn't use to do exercise

4 My classmate didn't use to study hard

5 People didn't use to have electricity

6 I used to be lazy

7 People didn't use to have TV

8 Sarah used to be short

Насчёт 6 и 8 я не уверена правильно ли