YOU SAID:
i dont understand you face
INTO JAPANESE
私はあなたの顔を理解していません
BACK INTO ENGLISH
i don't understand your face
INTO JAPANESE
あなたの顔がわからない
BACK INTO ENGLISH
i don't know your face
INTO JAPANESE
私はあなたの顔を知りません
BACK INTO ENGLISH
i don't know your face
Well done, yes, well done!