1. I do not understand this word. What does this word mean?
2. He plays the piano, but he does not play it very well./ He can play the piano, but he cannot play it very well.
3. When do your lessons begin? They begin at 9 am.
4. How often does Ann watch TV? She watches TV every day.
5. Where does your sister work? She is a doctor.
6. They do not like vegetables.
7. David has a big brother.
8. When do you have dinner?
9. Why are you so happy?
Слово cannot можно писать вместе,это не ошибка.