YOU SAID:
I swear I thought she was eighteen, please don't arrest me!
INTO JAPANESE
私は彼女が18歳だと思ったと誓います、私を逮捕しないでください!
BACK INTO ENGLISH
I swear she thought she was 18 years old, don't arrest me!
INTO JAPANESE
私は彼女が18歳だと思ったと誓います、私を逮捕しないでください!
BACK INTO ENGLISH
I swear she thought she was 18 years old, don't arrest me!
That didn't even make that much sense in English.