Pls give the answer of N

Dear student,

1. The girls have not eaten their food.
2. The little boy has not gone to bed.
3. Haven't they been studying since morning?
4. Hasn't she eaten the pizza?
5. Hasn't the watchman killed the snake?
6. Hasn't he composed a song?
7. Hasn't she been knitting since morning?
8. Don't these boys like to play rugby?

Regards