"Upon" is a preposition which is often translated as "en", and "call on" is a transitive verb phrase which is often translated as "recurrir". Learn more about the difference between "upon" and "call on" below.
A preposition is a word that indicates the relationship between a noun and another word (e.g. He ran through the door.).
1. (on)
a. en
He put his hand upon my hip and we danced.Puso su mano en mi cadera y bailamos.
b. sobre
I placed candles upon the mantel.Coloqué velas sobre la repisa.
2. (about)
a. sobre
She informed the audience of her thoughts upon the issue.Ella informó a la audiencia de sus pensamientos sobre el tema.
3. (immediately after)
a. al
Upon realizing what the situation was, he left.Al darse cuenta de la situación, se fue.
b. en cuanto
Upon seeing the body, she began to cry.En cuanto vio el cuerpo, se puso a llorar.
c. tras
Upon the president's arrival, the national anthem was sung.Tras la llegada del presidente, se cantó el himno nacional.
4. (used to indicate large amounts)
a. y
Thousands upon thousands of dead fish appeared on the beach.Aparecieron miles y miles de peces muertos en la playa.
b. tras
He drank beer upon beer until he passed out.Bebió una cerveza tras otra hasta que se desmayó.
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call on(
A transitive verb phrase is a phrase that combines a verb with a preposition or other particle and requires a direct object (e.g. Take out the trash.).
transitive verb phrase
1. (to seek help from)
a. recurrir
I'm lucky to have such good friends I can call on if I get myself in a jam.Soy afortunado de tener buenos amigos a quienes puedo recurrir si me meto en un aprieto.
b. apelar
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g. usted).
The principal has called on teachers to use a more holistic approach to teaching their students.La directora ha apelado a los profesores para que usen un enfoque más holístico al enseñar a sus alumnos.
2. (to visit)
a. visitar
I should like to call on you tomorrow afternoon if you're free.Me gustaría visitarte mañana por la tarde si estás libre.
b. pasar a ver
Russell is planning on calling on us when he's in town for the weekend.Russell está planeado pasar a vernos cuando esté por aquí el fin de semana.
3. (to ask to speak)
a. pasar la palabra
Every time the teacher calls on Dan, he knows how to answer.Cada vez que la maestra le pasa la palabra a Dan, él sabe cómo responder.
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