Why is "Mi abuelo es argentina" incorrect?

Answer 1

"Mi abuelo es argentina" is incorrect because the word "argentina" should be "argentino" to agree with the masculine noun "abuelo" (which means grandfather). "Argentina" is the feminine form of the adjective and should be used if referring to a female. Therefore, the correct sentence would be "Mi abuelo es argentino" if you want to say "My grandfather is Argentine."