vs 

QUICK ANSWER
"Cuál es tu deporte favorito" is a form of "cuál es tu deporte favorito", a phrase which is often translated as "what your favorite sport is". "Por qué" is a form of "por qué", a phrase which is often translated as "why". Learn more about the difference between "cuál es tu deporte favorito" and "por qué" below.
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(in statements; singular)
a. what your favorite sport is
Regionalism used in the United States
(United States)
Estamos organizando equipos, por eso quería preguntarte cuál es tu deporte favorito.We're organizing teams. That's why I wanted to ask you what your favorite sport is.
b. what your favourite sport is
Regionalism used in the United Kingdom
(United Kingdom)
Me estaba preguntando cuál es tu deporte favorito, porque tienes tipo de nadador.I was wondering what your favourite sport is, because you look like a swimmer.
2.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(in questions; singular)
a. what is your favorite sport
Regionalism used in the United States
(United States)
¿Cuál es tu deporte favorito de los de esta lista?What is your favorite sport of the ones in this list?
b. what is your favourite sport
Regionalism used in the United Kingdom
(United Kingdom)
¿Cuál es tu deporte favorito para ver en la tele?What is your favourite sport to watch on TV?
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por qué(
pohr
 
keh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. why (adverb)
¿Por qué no te gustan las guayabas?Why don't you like guavas?
a. why (adverb)
Me gustaría saber por qué los gatos ronronean.I would like to know why cats purr.
a. what (pronoun)
¡Por qué cascadas más hermosas pasó la lancha!What beautiful waterfalls the skiff passed through!
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. reason
No tenían por qué sospechar que yo era un espía.They had no reason to suspect I was a spy.
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