vs 

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"En" is a form of "en", a preposition which is often translated as "in". "Dentro" is an adverb which is often translated as "inside". Learn more about the difference between "dentro" and "en" below.
dentro(
dehn
-
troh
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. inside
Los niños están jugando dentro.The children are playing inside.
b. indoors
Tengo que irme dentro por mis alergias.I need to go indoors because of my allergies.
c. in
El gato está allí dentro.The cat's in there.
d. within
Ella carga un secreto pesado dentro.She carries a heavy secret within.
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en(
ehn
)
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
preposition
a. in
Hay comida ya preparada en el supermercado.There's ready-made food in the supermarket.
b. on
Puedes poner los cubiertos en la mesa.You can put the silverware on the table.
c. at
Los niños están en la escuela.The kids are at school.
a. in
En 1969 aterrizamos en la luna.In 1969, we landed on the moon.
a. in
Si un oso te persigue, corre en zigzag.If a bear is chasing you, run in a zig-zag formation.
a. by
No vinimos en avión; vinimos en tren.We didn't come by plane. We came by train.
a. about
¿En qué piensas?What are you thinking about?
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