vs 

QUICK ANSWER
"A qué" is a phrase which is often translated as "to what", and "infinitivo" is a noun which is often translated as "infinitive". Learn more about the difference between "a qué" and "infinitivo" below.
a qué(
ah
 
keh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. to what
¿A qué conclusión llegaste con tu investigación?To what conclusion did you arrive with your research?
b. what
No sé a qué libro te refieres, Pedro.I don't know what book you're referring to, Pedro.
c. at what
¿A qué hora llega el avión?At what time does the plane arrive?
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el infinitivo(
een
-
fee
-
nee
-
tee
-
boh
)
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. infinitive
En este caso, el verbo permanece en infinitivo.In this case, the verb remains in the infinitive.
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