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"Cuando hace frío" is a phrase which is often translated as "when it's cold", and "yo" is a pronoun which is often translated as "I". Learn more about the difference between "cuando hace frío" and "yo" below.
cuando hace frío()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. when it's cold
Cuando hace frío, el gato no sale de la casa.The cat never leaves the house when it's cold.
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)
