As a question it means, "Are you an American?"
As a declarative sentence it means, "You're an American."
Eres means "you are". Such as "You are American" = "Eres americano/a"
what are you?
Tú eres = You are
de donde eres = where are you from
you are
"Tu eres linda" means "you are beautiful" in English.
"Hola quien eres" translates to "hello who are you" in English.
It is masculine for "you are mean".
Tú eres americano. (using the informal 'tú) Usted es americano. (using the formal 'usted')
It's you
"Tu eres mi mundo" in English means "You are my world."
"Por que eres mujer" translated to English means "why are you a woman?"