Réponse:
1. N- She didn't draw a beautiful portrait last class
I- Did she draw a beautiful portrait last class?
2. N- He didn't pay the bill at the restaurant last night
I- Did he pay the bill.... Night?
3. N- You didn't write a very... Yesterday.
I- Did you write...?
4. N- He wasn't very happy.
I- Was he very happy?
5. N- They weren't sad
I- Were they sad?