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"Let" is a transitive verb which is often translated as "dejar", and "set free" is a phrase which is often translated as "liberar". Learn more about the difference between "let" and "set free" below.
let(
leht
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
1. (to allow)
a. alquilar
He is planning to let his apartment for three months.Está pensando alquilar su apartamento por tres meses.
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
set free(
seht
fri
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. liberar
The gates were opened and the prisoners were set free.Las rejas se abrieron y los prisioneros fueron liberados.
b. poner en libertad
If you give me the money, I will set Jonathan free.Si me das el dinero pondré en libertad a Jonathan.