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"Cuándo" is a form of "cuándo", an adverb which is often translated as "when". "Ese" is an adjective which is often translated as "that". Learn more about the difference between "cuándo" and "ese" below.
cuándo(
kwahn
-
doh
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. when
Nos vamos a casar, pero el cuándo y el dónde aún no lo sé.We are getting married, but I don't know when or where yet.
ese(
eh
-
seh
)An adjective is a word that describes a noun (e.g., the big dog).
A pronoun is a word that stands in for a noun (e.g., she).
a. that one (masculine singular)
Eligió ese, el que está más cerca.She chose that one, the nearest one.
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).