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"Yo" is a pronoun which is often translated as "I", and "a las tres de la tarde" is a phrase which is often translated as "at three o'clock in the afternoon". Learn more about the difference between "yo" and "a las tres de la tarde" below.
yo()
A pronoun is a word that stands in for a noun (e.g., she).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
3. (psychology)
a las tres de la tarde()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. at three o'clock in the afternoon
El avión sale a las tres de la tarde, así que tengo que estar en el aeropuerto a las doce.My plane leaves at three o'clock in the afternoon, so I have to be at the airport at twelve.