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QUICK ANSWER
"A qué hora" is a form of "a qué hora", a phrase which is often translated as "at what time". "Empezar" is an intransitive verb which is often translated as "to start". Learn more about the difference between "empezar" and "a qué hora" below.
empezar(
ehm
-
peh
-
sahr
)An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
a. to start by
Quiero empezar por darles la bienvenida esta noche.I'd like to start by welcoming you this evening.
b. to begin by
Quiero empezar por decirte lo mucho que aprecio todo lo que has hecho.I want to begin by saying how much I appreciate what you've done.
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
a qué hora(
ah
keh
oh
-
rah
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. at what time
¿A qué hora quedaste con Charlie? - A las 8 pm.At what time did you arrange to meet Charlie? - 8 pm.