YOU SAID:
I don't know what to say to you
INTO JAPANESE
私はあなたに何を言うか分かりません
BACK INTO ENGLISH
I do not know say anything to you
INTO JAPANESE
私はあなたに何も言ってわかりません
BACK INTO ENGLISH
I do not know to say to you anything
INTO JAPANESE
私はあなたに何かを言うことがわかりません
BACK INTO ENGLISH
I do not know to say something to you
INTO JAPANESE
私はあなたに何かを言うことがわかりません
BACK INTO ENGLISH
I do not know to say something to you
That didn't even make that much sense in English.