vs
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.
when(
wehn
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
2. (relative)
on which(
an
wihch
)A phrase is a group of words commonly used together (e.g., once upon a time).
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?
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.
a. acerca de cuál
Where can I get information on which system is best?¿Dónde puedo obtener información acerca de cuál sistema es mejor?
