YOU SAID:

How do you know this stuff

INTO JAPANESE

どうしてわかる？ さぁ、どうしてかな。

BACK INTO ENGLISH

How do you know that? Now, why?

INTO JAPANESE

どうしてそのことが分かるんですか。さて、なぜですか?

BACK INTO ENGLISH

How do you know that? Now, why not?

INTO JAPANESE

どうしてそのことが分かるんですか。さて、なぜですか?

BACK INTO ENGLISH

How do you know that? Now, why not?