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QUICK ANSWER
"Estoy bien" is a form of "estoy bien", a phrase which is often translated as "I am well". "Tu" is a form of "tu", an adjective which is often translated as "your". Learn more about the difference between "estoy bien" and "tu" below.
estoy bien(
ehs
-
toy
byehn
)A phrase is a group of words commonly used together (e.g., once upon a time).
b. I am fine
¡Tanto tiempo! ¿Cómo has estado? - Estoy bien, un poco cansado.It's been so long! How have you been? - I am fine, a little tired.
c. I'm well
¿Cómo te sientes esta mañana? - Estoy bien; ya no me duele la cabeza.How are you feeling this morning? - I'm well; my headache's gone.
d. I'm fine
¿Quieres tomar algo? - No, gracias, estoy bien.Would you like something to drink? - No, thanks, I'm fine.
e. I'm good (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Hola, Quique! ¿Cómo andas? - Estoy bien.Hi, Quique! How are you? - I'm good.
f. I'm OK
¿Necesitas algo? - Nada, gracias. Estoy bien.Is there anything you need? - Nothing, thanks. I'm OK.
tu(
too
)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?).