YOU SAID:
Impostor was not an impostor
INTO JAPANESE
詐欺師は詐欺師ではなかった
BACK INTO ENGLISH
The scammer was not a scammer
INTO JAPANESE
詐欺師は詐欺師ではありませんでした
BACK INTO ENGLISH
The scammer was not a scammer
That didn't even make that much sense in English.