vs 

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"Tu" is a form of "tu", an adjective which is often translated as "your". "Muy bien, gracias" is a phrase which is often translated as "very well, thank you". Learn more about the difference between "muy bien, gracias" and "tu" below.
muy bien, gracias(
mooee
 
byehn
 
grah
-
syahs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. very well, thank you
¿Cómo está usted, señora? - Muy bien, gracias. ¿Y usted?How are you, ma'am? - I'm very well, thank you. And you?
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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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