YOU SAID:

What?? I can’t understand you.

INTO JAPANESE

何？？あなたの言うことが理解できません。

BACK INTO ENGLISH

what? ? I can't understand what you're saying.

INTO JAPANESE

何？ ?何を言っているのか理解できません。

BACK INTO ENGLISH

what? ?I don't understand what you're saying.

INTO JAPANESE

何？ ?何を言っているのか分かりません。

BACK INTO ENGLISH

what? ?I don't understand what you're saying.