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QUICK ANSWER
"Que hacías cuando eras niño" is a form of "que hacías cuando eras niño", a phrase which is often translated as "that you used to do when you were a child". "A" is a preposition which is often translated as "to". Learn more about the difference between "que hacías cuando eras niño" and "a" below.
que hacías cuando eras niño(
keh
ah
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see
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ahs
kwahn
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doh
eh
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rahs
nee
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nyoh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. that you used to do when you were a child
Tu madre me contó algunas de las cosas que hacías cuando eras niño. Debías ser malísimo.Your mother told me some of the things that you used to do when you were a child. You must have been really naughty.
b. that you did as a child
Es normal que ya no te guste hacer las actividades que hacías cuando eras niño.It's normal that you don't like to do the activities that you did as a child.
a, la a(
ah
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Podía respirar a duras penas.He was hardly able to breathe.
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
¡A fregar los platos!Go do the dishes!
¡A la cama!Off to bed!
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Me encantaría ganar dinero a espuertas.I would love to earn lots of money.
Llovía a cántaros.It was pouring.
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
a. A
El circuito transporta una corriente de 1 A.The circuit carries a current of 1 A.
La intensidad de la corriente eléctrica se mide en A.The intensity of an electric current is measured in A.