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 que" is a form of "por que", a phrase which is often translated as "why". Learn more about the difference between "cuál es tu clase favorita" and "por que" 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 que(
pohr
 
keh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. why
Estoy embarazada. Ese es el motivo por que te llamo.I'm pregnant. That's why I'm calling you.
b. for
Los premios por que competían no resultaban muy atractivos.The prizes they were competing for weren't very attractive.
c. that
La razón por que estoy aquí es por que quería pedirte perdón.The reason that I am here is that I wanted to say sorry.
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Al final los padres optaron por que su hija no participara en el concurso.In the end, the parents chose not to have their daughter take part in the contest.
Están ansiosos por que empecemos a trabajar en el proyecto.They're eager for us to begin work on the project.
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