Quick answer
"When" is an adverb which is often translated as "cuándo", and "on which" is a phrase which is often translated as "sobre el cual". Learn more about the difference between "when" and "on which" below.
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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on which
A phrase is a group of words commonly used together (e.g once upon a time).
1. (after a noun)
a. sobre el cual
The assumptions on which your thesis is based are false.Los supuestos sobre los cuales se basa su tesis son falsos.
b. sobre el que
Can you see the shelf on which the books are?¿Alcanzas a ver el estante sobre el que están los libros?
c. en el que
The train on which he arrived was late.El tren en el que vino llegó atrasado.
d. en el cual
The company informed that the flight on which the incident occurred was overbooked.La empresa informó que el vuelo en el cual tuvo lugar el incidente estaba sobrevendido.
2. (in questions)
a. acerca de cuál
Where can I get information on which system is best?¿Dónde puedo obtener información acerca de cuál sistema es mejor?
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