YOU SAID:

what's that? i don't understand what you mean!

INTO JAPANESE

あれは何でしょう？私はあなたがどういう意味か理解していません！

BACK INTO ENGLISH

what's that? I do not understand what you mean!

INTO JAPANESE

あれは何でしょう？あなたが何を言っているか理解できません！

BACK INTO ENGLISH

what's that? I do not understand what you are saying!

INTO JAPANESE

あれは何でしょう？あなたの言いたいことがわかりません！

BACK INTO ENGLISH

what's that? I do not know what you want to say!

INTO JAPANESE

あれは何でしょう？私はあなたが何を言いたいのかわかりません！

BACK INTO ENGLISH

what's that? I do not know what you want to say!