YOU SAID:
How could I be so stupid if I didn’t know that
INTO JAPANESE
それを知らなかったらどうしてこんなにバカになれるんだろう
BACK INTO ENGLISH
How could you be so stupid if you didn't know that?
INTO JAPANESE
それを知らなかったらどうしてそこまで愚かになれるでしょうか?
BACK INTO ENGLISH
How could you be so stupid if you didn't know that?
Well done, yes, well done!