vs 

QUICK ANSWER
"Cuál es tu clase favorita" is a form of "cuál es tu clase favorita", a phrase which is often translated as "what your favorite class 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 clase favorita" and "por qué" below.
cuál es tu clase favorita(
kwahl
 
ehs
 
too
 
klah
-
seh
 
fah
-
boh
-
ree
-
tah
)
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)
(singular)
a. what your favorite class is
Si te preguntaran cuál es tu clase favorita, ¿qué responderías? - Mi clase favorita es educación física.If anyone asked you what your favorite class is, what would you answer? - My favorite class is PE.
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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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