In Spanish, adjectives generally go AFTER the noun. This is a big difference than in English.
For example:
I have a red car. = Yo tengo un carro rojo.
You are a nice friend. = Tú eres un amigo simpático.
They are funny teachers. = Son profesores graciosos.
To make a sentence negative, put no before the verb.
Yo NO soy OR No soy
Tú NO tienes OR No tienes
Pablo no es OR No es
I am not a lazy person.= (Yo) no soy una persona perezosa.
We are not lazy students. = (Nosotros) no somos estudiantes perezosos.
My cats are not lazy cats. = Mis gatos no son gatos perezosos.