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"Porque" is a form of "porque", a conjunction which is often translated as "because". "Por la cual" is a phrase which is often translated as "why". Learn more about the difference between "por la cual" and "porque" below.
por la cual(
pohr
lah
kwahl
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. by which
El internet es la vía por la cual los miembros del equipo se comunican todos los días.The internet is the means by which the team members communicate with each other every day.
b. through which
La aorta es la arteria por la cual pasa la sangre al resto de las arterias.The aorta is the artery through which the blood gets to the rest of the arteries.
porque(
pohr
-
keh
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
a. because
Mi hermano está triste porque no ganó el concurso.My brother is upset because he did not win the contest.