Quick answer
"Cannot" is an auxiliary verb which is often translated as "no poder", and "must not" is an auxiliary verb which is often translated as "no deber". Learn more about the difference between "cannot" and "must not" below.
cannot(
kah
-
nat
)
An auxiliary verb, or helper verb, is a conjugated verb that comes before a main verb and determines the main verb's tense, mood, or aspect (e.g. I have gone.).
1. (general)
a. no poder
We cannot tolerate these discriminatory actions.No podemos tolerar estos actos discriminatorios.
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must not
An auxiliary verb, or helper verb, is a conjugated verb that comes before a main verb and determines the main verb's tense, mood, or aspect (e.g. I have gone.).
1. (used to express obligation)
a. no deber
They must not find out about our plan.No deben enterarse de nuestro plan.
b. no hay que
We must not be too reckless, or our strategy will fail.No hay que ser demasiado imprudentes, o nuestra estrategia terminará en el fracaso.
2. (used to express likelihood)
a. no deber de
That guy is parking in front of a fire hydrant. He must not realize it's there.Ese tipo está estacionando delante una boca de incendios. No debe de darse cuenta de que está ahí.
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