YOU SAID:
you mustn't polish spectacles with black shoe polish
INTO JAPANESE
あなたは黒い靴磨きで眼鏡を磨いてはいけません
BACK INTO ENGLISH
You should not brush your glasses with black shoe polish
INTO JAPANESE
あなたは黒の靴磨きであなたの眼鏡を磨くべきではありません
BACK INTO ENGLISH
You should not brush your glasses with black shoe polish
Well done, yes, well done!