Quick answer
"Which" is a pronoun which is often translated as "cuál", and "when" is an adverb which is often translated as "cuándo". Learn more about the difference between "which" and "when" below.
which(
wihch
)
A pronoun is a word that stands in for a noun (e.g. she).
1. (in questions)
a. cuál
Which are the classes that interest you this semester?¿Cuáles son las clases que te interesan este semestre?
Which do you prefer? The pasta or the salad?¿Cuál prefieres? ¿La pasta o la ensalada?
2. (in relative clauses)
a. que
The invitation, which was mailed to you, is for our wedding.La invitación, que se te mandó, es para nuestra boda.
b. el cual
The village has a castle, which dates from the 12th century.El pueblo tiene un castillo, el cual data del siglo XII.
c. la cual
The actor's house, which is on top of a hill, has a wonderful view of LA.La casa del actor, la cual está en lo alto de una colina, tiene unas vistas maravillosas de Los Ángeles.
d. lo cual
She didn't support me when I needed her, which made me realize that she wasn't a real friend.No me apoyó cuando la necesité, lo cual me hizo pensar que no era una amiga de verdad.
e. los cuales
There are several books on the subject, which are available in the library.Existen varios libros sobre el tema, los cuales están disponibles en la biblioteca.
f. las cuales
He explained it using some scientific words, which I have forgotten.Lo explicó con unas palabras científicas, las cuales no recuerdo.
An adjective is a word that describes a noun (e.g. the big dog).
3. (in questions)
a. qué
Which type of food do you want to serve at the party?¿Qué tipo de comida quieres servir en la fiesta?
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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).
1. (in questions)
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.).
2. (relative)
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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