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"Upon" is a preposition which is often translated as "en", and "across" is a preposition which is often translated as "a través de". Learn more about the difference between "upon" and "across" below.
upon(
uh
-
pan
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
across(
uh
-
kras
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
b. de un lado a otro
He walked across the store looking for the perfect toy for his son.Fue de un lado a otro de la tienda buscando el juguete ideal para su hijo.
a. enfrente de
My best friend lives across the street from us.Mi mejor amigo vive enfrente de nosotros.
3. (throughout)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).