1) Сould you write essays when you were 7? No, I couldn't
2)Can your parents speak English? Yes, they can
3)Could you watch TV until midnight when you were 8? No, I couldn't
4)Can you ride a bicycle yet? yes, I can
5)Could you play football when you were 8? No, I couldn't
6)Can you choose which days you go to school? No, I can't
1)have to
2)mustn't
3)don't have to
4)must
5)shouldn't
6)should