YOU SAID:

do you know how to do the thing

INTO JAPANESE

あなたはそのことをする方法を知っていますか

BACK INTO ENGLISH

Do you know how to do that

INTO JAPANESE

そんな事どうやって覚えた？

BACK INTO ENGLISH

Why do you know how to do that?

INTO JAPANESE

そんな事どうやって覚えた？

BACK INTO ENGLISH

Why do you know how to do that?