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QUICK ANSWER
"Y tú" is a form of "y tú", a phrase which is often translated as "and you". "¿Quién eres?" is a phrase which is often translated as "Who are you?". Learn more about the difference between "¿Quién eres?" and "y tú" below.
¿Quién eres?(
kyehn
eh
-
rehs
)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. Who are you?
Perdona, pero no te recuerdo. ¿Quién eres?Sorry, but I don't remember you. Who are you?
y tú(
ee
too
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (second person 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. 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.