Quick answer
"Deber de" is an auxiliary verb which is often translated as "must", and "ir a" is an intransitive verb phrase which is often translated as "to go to". Learn more about the difference between "deber de" and "ir a" below.
deber de(
deh
-
behr
 
deh
)
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 with an infinitive to express probability)
a. must
Debe de ser muy interesante poder viajar a las islas Galápagos.It must be really interesting to be able to travel to the Galapagos Islands.
2.
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
(used with an infinitive to express obligation)
a. have to
Esto es chantaje, Juan. Debes de decírselo a la policía.This is blackmail, Juan. You have to tell the police.
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
3. (used as a noun to indicate responsibility)
a. duty to
Tengo el deber de comunicarle que su presencia en nuestro país no es bien recibida.It is my duty to inform you that your presence in our country is not welcome.
b. obligation as
Mi deber de ciudadano es denunciar este delito ambiental a las autoridades.My obligation as a citizen is to report this environmental crime to the authorities.
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ir a(
eer
 
ah
)
An intransitive verb phrase is a phrase that combines a verb with a preposition or other particle and does not require a direct object (e.g. Everybody please stand up.).
intransitive verb phrase
1. (to go to a place)
a. to go to
¿Vas a ir a la fiesta el sábado?Are you going to go to the party on Saturday?
Debes ir a la escuela antes de que se haga más tarde.You should go to school before it gets any later.
2. (used to express intentionality)
a. to go
¿Puedes ir a preguntarle a tu hermano si quiere cenar?Can you go and ask your brother if he wants to have dinner?
b. to be going to
Voy a regar el jardín cuando baje el sol.I'm going to water the garden when the sun goes down.
irse a
A pronominal verb phrase combines a verb with a preposition or other particle and always uses a reflexive pronoun. (e.g. Se dio cuenta del problema.)
pronominal verb phrase
3. (to depart for)
a. to go to
¿Dónde están María y Ana? - Se han ido a la playa.Where are Maria and Ana? - They've gone to the beach.
b. to leave for
¿Cuáles son sus planes? - El lunes nos vamos a Ámsterdam y el martes volaremos a Ciudad del Cabo.What are your plans? - We're leaving for Amsterdam on Monday and we'll fly to Cape Town on Tuesday.
4. (used to express intentionality)
a. to be going to
Me voy a sentar en este banco porque estoy muy cansada.I'm going to sit on this bench because I'm very tired.
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