Question

il est un Garcon in feminine​

Answer 1

Unlike English, however, all French nouns also have a gender: masculine or feminine. In some instances, the gender of the noun is apparent: un garçon (a boy) is masculine, whereas une fille (a girl) is feminine.

Answer 2

Answer: Elle est une fille

Explanation: il is for male while in feminine elle is used. est still remains. un will change to une because we are converting to feminine. And lastly Garcon changes to Fille.