YOU SAID:

that's weird. why does it do that?

INTO JAPANESE

変です。なぜするか。

BACK INTO ENGLISH

It is strange. Why do you?

INTO JAPANESE

それは奇妙です。なぜか。

BACK INTO ENGLISH

It is weird. Why not?

INTO JAPANESE

それは奇妙です。なぜ駄目なのですか。

BACK INTO ENGLISH

It is weird. Why not?