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"Escribir una carta" is an intransitive verb phrase which is often translated as "to write a letter", and "yo" is a pronoun which is often translated as "I". Learn more about the difference between "escribir una carta" and "yo" below.
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
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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yo(
yoh
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. I
Yo soy su hermana.I am her sister.
a. me
Ella es más joven que yo.She is younger than me.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. ego
Tu yo es tu esencia.Your ego is your essence.
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