vs 

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"When I was young" is a phrase which is often translated as "cuando yo era joven", and "used to" is a phrase which is often translated as "soler". Learn more about the difference between "when I was young" and "used to" below.
when I was young(
wehn
 
ay
 
wuhz
 
yuhng
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. cuando yo era joven
"When I was young, this field was a forest," the man said to his son. "Cuando yo era joven, este campo era un bosque", el hombre le dijo a su hijo.
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used to(
yus
 
tu
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
My family used to go to the beach every summer when I was a kid.Mi familia iba a la playa todos los veranos cuando era niño.
Our coworker used to have the cutest pet rabbit named Bunthony Hopkins.Nuestra compañera tenía un conejito monísimo llamado Bunthony Hopkins.
b. soler (only in the imperfect)
My grandfather used to hide chocolate from my grandmother all over the house.Mi abuelo solía esconder chocolates de mi abuela por toda la casa.
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