vs 

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"How many" is a phrase which is often translated as "cuántos", and "when" is an adverb which is often translated as "cuándo". Learn more about the difference between "how many" and "when" below.
how many(
hau
 
meh
-
ni
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. cuántos
How many days will you be out?¿Cuántos días vas a estar fuera?
How many pets do you have?¿Cuántas mascotas tienes?
a. cuanto
You pay depending on how many you choose.Pagas en base a cuantos escojas.
b. número de
There is a limit to how many times a cell can divide.Hay un límite al número de veces que una célula se puede dividir.
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when(
wehn
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. cuándo
When was the last time you cried?¿Cuándo fue la última vez que lloraste?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. cuando
I was sleeping when he got home.Estaba durmiendo cuando llegó a casa.
b. en que
That was the year when we bought our first apartment.Ese fue el año en que compramos nuestro primer apartamento.
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