Quick answer
"Deberías" is a form of "deber", a transitive verb which is often translated as "to owe". "No debes" is a phrase which is often translated as "you shouldn't". Learn more about the difference between "deberías" and "no debes" below.
deber(
deh
-
behr
)
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to reciprocate)
a. to owe
El dinero que me debe cubriría mis facturas.The money he owes me would cover my bills.
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.).
2. (used to express obligation)
a. must (used with an infinitive)
Debo ser responsable.I must be responsible.
b. have to
Ya sabes que debes ponerte la corbata para ir al colegio.You know you have to wear your tie to go to school.
c. should
Los culpables de delitos viales deben ser sancionados.Traffic offenders should be punished.
d. ought to
Deberías ser más amable con los vecinos.You ought to be more polite with our neighbors.
3. (used to express possibility)
a. must (used with an infinitive)
¿Cuántos años tiene tu profesora de francés? - Debe tener unos cuarenta.How old is your French teacher? - She must be around forty.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
4. (responsibility)
a. duty
Es mi deber proteger mi país.It's my duty to protect my country.
b. obligation
Es tu deber como madre cuidar a tus hijos.It's your obligation as a mother to take care of your children.
deberes
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
5. (education)
a. homework
Tengo un montón de deberes que hacer este fin de semana.I have a ton of homework to do this weekend.
deberse
A pronominal verb always uses a reflexive pronoun. (e.g. Te ves cansado.).
6. (to be the result of; used with "a")
a. to be due to
Esta situación se debe a la falta de información.This situation is due to a lack of information.
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no debes(
noh
 
deh
-
behs
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1.
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(used to make a suggestion; second person singular)
a. you shouldn't
Si estás intentando perder peso, no debes beber alcohol.If you're trying to lose weight, you shouldn't drink alcohol.
2.
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(used to give an order; second person singular)
a. you mustn't
El avión despega a las 9:30 am. No debes llegar tarde.The airplane takes off at 9:30 am. You mustn't be late.
3.
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(you have no debt or obligation; second person singular)
a. you don't owe
¿Tengo que pagar algo? - No. No debes nada.Do I need to pay anything? - No. You don't owe anything.
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