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"Las mochilas" is a form of "mochila", a noun which is often translated as "backpack". "Detrás de" is a preposition which is often translated as "behind". Learn more about the difference between "las mochilas" and "detrás de" below.
la mochila(
moh
-
chee
-
lah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (knapsack)
a. backpack (United States)
Regionalism used in the United States
El libro está en mi mochila.The book is in my backpack.
b. rucksack (United Kingdom)
Regionalism used in the United Kingdom
Llenó la mochila de agua, papas y libros.She filled her rucksack with water, crisps, and books.
c. schoolbag
¡Cuánto pesa la mochila! ¿Tienes mucha tarea hoy?Your schoolbag is so heavy! Do you have a lot of homework today?
d. pack (for trekking or expeditions)
Los soldados llevaban sus mochilas encima de sus cabezas para que la lluvia no los mojara.The soldiers carried their packs over their heads so they didn't get wet in the rain.
detrás de(
deh
-
trahs
deh
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
