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QUICK ANSWER
"En" is a form of "en", a preposition which is often translated as "in". "Dentro de" is a preposition which is often translated as "inside". Learn more about the difference between "dentro de" and "en" below.
dentro de()
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
2. (time limit)
en()
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
