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"What" is a form of "what", a pronoun which is often translated as "qué". "How many" is a phrase which is often translated as "cuántos". Learn more about the difference between "how many" and "what" below.
how many(
hau
meh
-
ni
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. cuántos
How many days will you be out?¿Cuántos días vas a estar fuera?
How many pets do you have?¿Cuántas mascotas tienes?
what(
wuht
)A pronoun is a word that stands in for a noun (e.g., she).
An adjective is a word that describes a noun (e.g., the big dog).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).