YOU SAID:

katie was a boy but is now a girl.

INTO JAPANESE

ケイティは男の子でしたが、今は女の子です。

BACK INTO ENGLISH

Katie used to be a boy, but now she's a girl.

INTO JAPANESE

ケイティは男の子だったけど、今は女の子。

BACK INTO ENGLISH

Katie used to be a boy, but now she's a girl.