Quick answer
"Ought" is an auxiliary verb which is often translated as "deber", and "must" is an auxiliary verb which is also often translated as "deber". Learn more about the difference between "ought" and "must" below.
ought(
at
)
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. (indicating advisability)
a. deber (conditional tense)
You ought to see a doctor about that knee.Deberías consultar a un médico por esa rodilla.
2. (indicating probability)
a. deber (conditional tense)
Those vegetables ought to be done by now.Esas verduras ya deberían estar cocidas.
3. (indicating obligation)
a. deber (conditional tense)
You ought not to have taken the book without asking.No deberías haberte llevado el libro sin pedir permiso.
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must(
muhst
)
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. (obligation)
a. deber
You must stay in bed after the operation.Debes quedarte en cama después de la operación.
b. tener que
You must bring your books to class.Tienes que traer tus libros a clase.
2. (suggestion)
a. tener que
We must have lunch some time.Tenemos que quedarnos a almorzar un día de estos.
3. (likelihood)
a. deber de
You must be very tired after your long drive.Debes de estar muy cansado después de manejar tanto.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (indispensable thing)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Having a cell phone is a must nowadays.Hoy en día es indispensable tener un celular.
This album is a must for all fans of jazz music.Este es un álbum que no deben perderse todos los aficionados a la música jazz.
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