vs 

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"Tu" is a form of "tu", an adjective which is often translated as "your". "Todo bien, gracias" is a phrase which is often translated as "everything's fine, thank you". Learn more about the difference between "tu" and "todo bien, gracias" below.
tu(
too
)
An adjective is a word that describes a noun (e.g., the big dog).
adjective
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)
(possessive)
a. your
Mi casa es tu casa.My house is your house.
Ahora es tu turno.Now it's your turn.
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todo bien, gracias(
toh
-
doh
 
byehn
 
grah
-
syahs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. everything's fine, thank you
¿Cómo van las cosas en casa, Joe? - Todo bien, gracias.How's things at home, Joe? - Everything's fine, thank you.
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