She's Korean.
She isn't Korean.
I don't like cooking.
I like cooking.
She doesn't speak Spanish.
She speaks Spanish.
They want to learn English.
They don't want to learn English.
We're tired and we want to go to bed.
We aren't tired and we don't want to go to bed.
Roberto likes watching football on TV, but he doesn't like playing it.
Roberto doesn't like watching football on TV, but he likes playing it.
I work at home because I have a computer.
I don't work at home because I don't have a computer.
Amelia isn't happy because she doesn't have a new car.
Amelia is happy because she has a new car.
I don't go to bed early.
I go to bed early.
He goes to bed early.
He doesn't go to bed early.
