Did ABBA do a song called eres tu It means it is you or and was by an group who sang American songs back in the early 70s i believe. I am hispanic know speeling correct?

ABBA did not record a song titled "Eres Tú." The song you are thinking of is by Mocedades, a Spanish vocal group. The original title of the song is "¿Eres Tú?" released in 1973. Mocedades recorded an English version titled “Touch the Wind” the same year.