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"A las tres de la tarde" is a phrase which is often translated as "at three o'clock in the afternoon", and "escribir una carta" is an intransitive verb phrase which is often translated as "to write a letter". Learn more about the difference between "a las tres de la tarde" and "escribir una carta" below.
a las tres de la tarde(
ah
 
lahs
 
trehs
 
deh
 
lah
 
tahr
-
deh
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
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.
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An intransitive verb phrase is a phrase that combines a verb with a preposition or other particle and does not require a direct object (e.g. Everybody please stand up.).
intransitive verb phrase
1. (general)
a. to write a letter
En lugar de decírselo cara a cara, Rosa le escribió una carta explicándole por qué lo dejaba.Instead of telling him face to face, Rosa wrote him a letter explaining why she was leaving him.
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