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"Esta" is a form of "esta", an adjective which is often translated as "this". "Por qué" is a form of "por qué", a phrase which is often translated as "why". Learn more about the difference between "esta" and "por qué" below.
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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).