Afirmativa:

Children are nice.
Children are bad.
Children like to play games.
Children get hurt playing games.
Children cry often.
Children need to learn how to cook.
Children are small.

Interrogativa:

Are children nice?
Are children bad?
Do children like to play games?
Do children get hurt while playing games?
Do children cry often?
Do children need to learn how to cook?
Are children small?

Negativa:

Children aren't nice.
Children aren't bad.
Children don't like to play games.
Children don't get hurt playing games.
Children don't cry often.
Children don't need to learn how to cook.
Children aren't smelly.