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QUICK ANSWER
"Tu" is a form of "tu", an adjective which is often translated as "your". "Bien, gracias" is a phrase which is often translated as "fine, thank you". Learn more about the difference between "bien, gracias" and "tu" below.
bien, gracias()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
tu()
An adjective is a word that describes a noun (e.g., the big dog).
1. (informal) (possessive)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
