YOU SAID:
How to when you do that?
INTO JAPANESE
あなたがそれをするときどうすればいいですか?
BACK INTO ENGLISH
What do you do when you do it?
INTO JAPANESE
あなたがそれをするとき、あなたは何をしますか?
BACK INTO ENGLISH
What do you do when you do it?
That didn't even make that much sense in English.