1. We usually have dinner at 2 o'clock.
Do we usually have dinner at 2 o'clock?
We don't usually have dinner at 2 o'clock.
2. She had classes till 3 o'clock yesterday.
Did she have classes till 3 o'clock yesterday?
She didn't have classes till 3 o'clock yesterday.
3. They will have more spare time in a few days.
Will they have more spare time in a few days?
They won't have more spare time in a few days.