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"Cual" is a form of "cual", a pronoun which is often translated as "which". "De qué" is a phrase which is often translated as "what". Learn more about the difference between "cual" and "de qué" below.
cual(
kwahl
)A pronoun is a word that stands in for a noun (e.g., she).
1. (relative)
de qué(
deh
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).