Negations in the present simple
The rules on how to make questions in the present simple also apply to how to make negations (= ontkenningen).
Examples:
He reads a book. - He doesn't read a book.
Lara is fed up with maths. - Lara isn't fed up with maths.
We can order books online. - We can't order books online.
You are being silly. - You aren't being silly.