YOU SAID:

Hello, I don't know you do one.

INTO JAPANESE

こんにちは、私はあなたがそれをすることを知りません。

BACK INTO ENGLISH

Hi, I don't know you do it.

INTO JAPANESE

どうしたらいいか分からない

BACK INTO ENGLISH

I don't know how you do it.

INTO JAPANESE

どうしたらいいか分からない

BACK INTO ENGLISH

I don't know how you do it.