1 Has she worked hard?
She hasn't worked hard.
2 Have they bought a car?
They haven't bought a car.
3 Have you made a nice cake.
You haven't made a nice cake.
4 Was she doing her homework from 4 till 6 o'clock yesterday?
She wasn't doing her homework from 4 till 6 o'clock yesterday.
5 Will he be watching TV the whole evening tomorrow?
He won't be watching TV the whole evening tomorrow.