You can substitute "should" for "ought to," without changing the sense of the sentence.
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.).
auxiliary verb
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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auxiliary verb
En el inglés hablado, y en el escrito en estilo coloquial, la forma negativa ought not se transforma en oughtn't.
1. deber, tener que (expressing obligation, desirability)
  • I ought to be going tendría que irme ya
  • you oughtn't to worry so much no deberías preocuparte tanto
  • I thought I ought to let you know about it me pareció que deberías saberlo
  • he had drunk more than he ought to había bebido or tomado más de la cuenta (Am)
  • this ought to have been done before esto se tenía que haber hecho antes
  • they ought not to have waited no tenían que haber esperado
2. (expressing probability)
  • they ought to be in Paris by now a estas horas tendrían que estar ya en París
  • you ought to be able to get £150 for the painting deberías conseguir al menos 150 libras por el cuadro
Copyright © 2006 Harrap Publishers Limited
ought [ɔːt]
modal verb
1 (moral obligation) deber
I ought to do it debería hacerlo; debiera hacerlo; one ought not to do it no se debiera hacer; I ought to have done it debiera haberlo hecho; you ought to have warned me me deberías haber avisado; he ought to have known debía saberlo; I thought I ought to tell you me creí en el deber de decírselo; to behave as one ought comportarse como se debe
2 (vague desirability)
you ought to go and see it vale la pena ir a verlo; you ought to have seen him! ¡tenías que haberle visto!
3 (probability) deber
he ought to win debería ganar; that ought to be enough con eso debería ser suficiente; he ought to have arrived by now debería de haber llegado ya
ought [ɔːt]
Collins Complete Spanish Electronic Dictionary © HarperCollins Publishers 2011
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