vs 

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"De dónde son" is a form of "de dónde son", a phrase which is often translated as "where are they from". "¿Y ustedes?" is a phrase which is often translated as "And you?". Learn more about the difference between "de dónde son" and "¿Y ustedes?" below.
de dónde son(
deh
 
dohn
-
deh
 
sohn
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. where are they from
Esperamos a varios invitados al congreso. - ¿A cuántos esperan y de dónde son?We expect several guests at the conference. - How many do you expect and where are they from?
a. where they're from
¡Qué lindos caracoles! Dime de dónde son.Those shells are lovely! Tell me where they're from.
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¿Y ustedes?(
ee
 
oos
-
tehd
-
ehs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. And you?
Nosotros nos vamos. ¿Y ustedes? - Nos quedamos.We're leaving. And you? - We're staying.
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