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QUICK ANSWER
"Cómo funciona" is a form of "cómo funciona", a phrase which is often translated as "how it works". "Como funciona" is a form of "como funciona", a phrase which is often translated as "since it works". Learn more about the difference between "cómo funciona" and "como funciona" below.
cómo funciona(
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A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. how it works
Si has usado alguna vez la impresora, ¿me puedes decir cómo funciona, por favor?If you've ever used the printer, can you please tell me how it works?
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
No sé cómo funciona la lavadora porque todavía no la he usado.I don't know how the washing machine works because I haven't used it yet.
Hoy el profesor de física nos ha explicado cómo funciona el motor de combustión interna.Today our physics teacher has explained how the internal combustion engine works.
a. how does it work
¿Qué es ese aparato que tienes encima de la mesa? ¿Para qué se usa y cómo funciona?What's that device you have on the table? What's it used for and how does it work?
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
¿Cómo funciona este televisor? Intenté encenderlo, pero no pude.How does this television set work? I tried to turn it on, but I couldn't.
¿Cómo funciona esta tostadora? Nunca había visto una así.How does this toaster work? I've never seen one like it.
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como funciona(
koh
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moh
 
foon
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syoh
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nah
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A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. since it works
Ese secador es muy viejo, ¿no? - Sí, pero, como funciona, lo sigo usando.That hairdryer is very old, isn't it? - Yes, but since it works, I keep using it.
b. as it works
¿Vas a tirar la computadora vieja? - No, como funciona todavía, la voy a guardar, por si acaso.Are you going to throw your old computer away? - No, as it still works, I'm going to keep it, just in case.
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