vs 

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"Cuántos años tienes" is a form of "cuántos años tienes", a phrase which is often translated as "how old you are". "Y tú" is a form of "y tú", a phrase which is often translated as "and you". Learn more about the difference between "cuántos años tienes" and "y tú" below.
cuántos años tienes(
kwahn
-
tohs
 
ah
-
nyohs
 
tyeh
-
nehs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. how old you are
Dime tu nombre y cuántos años tienes.Tell me what's your name and how old you are.
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y tú(
ee
 
too
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(second person singular)
a. and you
Él siempre hace lo que quiere, y tú nunca te quejas.He always does what he wants, and you never complain.
Yo sabía que había algo entre Carmen y tú.I knew there was something going on between you and Carmen.
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