La oración negativa se forma añadiendo not
(o n't en la forma abreviada)
· a un auxiliar (have, be, do, must, can...).
· a be y have cuando se emplean como
verbos principales.
Ejemplo: I am at work.
I am not (I'm not) at work.
You are my best friend.
You are not (aren't) my best friend.
He has enough money.
He has not (hasn't) enough money.
Insusceptible