YOU SAID:

why didn't I think of that? How could I be so dumb? Huh?

INTO JAPANESE

なぜ私はそれを考えなかったのですか？私はどうしてそんなに馬鹿にすることができますか？ハァッ？

BACK INTO ENGLISH

Why did not I think of that? How can I make such a fool? Huh?

INTO JAPANESE

なぜ私はそれを考えなかったのですか？私はどうやってそのような馬鹿を作ることができますか？ハァッ？

BACK INTO ENGLISH

Why did not I think of that? How can I make such an idiot? Huh?

INTO JAPANESE

なぜ私はそれを考えなかったのですか？そんなばかなことをどうやって作るの？ハァッ？

BACK INTO ENGLISH

Why did not I think of that? How do you make such a foolish thing? Huh?

INTO JAPANESE

なぜ私はそれを考えなかったのですか？そんな愚かなことをどうやって作るの？ハァッ？

BACK INTO ENGLISH

Why did not I think of that? How do you make such a foolish thing? Huh?