debes
Translation
(you) must, (you) have to, (you) need
Conjugation of deber
No debes mirar tu celular mientras cruzas la calle.
You shouldn't look at your cellphone while you cross the street.
¡No debes manejar sin tu licencia de conducir!
You shouldn't drive without your driver's license!
Ana, no debes manejar si bebiste alcohol.
Ana, you shouldn't drive if you drank alcohol.
All conjugations of deber
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