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QUICK ANSWER
"Cuál es tu asignatura favorita" is a form of "cuál es tu asignatura favorita", a phrase which is often translated as "what's your favorite subject". "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 asignatura favorita" and "por qué" below.
cuál es tu asignatura favorita
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (in questions; second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. what's your favorite subject
¿Cuál es tu asignatura favorita? - Me encanta la matemática.What's your favorite subject? - I love math.
2. (informal) (in statements; second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. what your favorite subject is
Dime, Ramón, cuál es tu asignatura favorita y cuál es la que menos te gusta.Tell me, Ramon, what your favorite subject is, and what the one you like the least is.
por qué(
pohr
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
