BOTH与ALL的不同之处在于以下几点：
前者和后者的汉语意思虽都为“都”,但BOTH用于“两者都”,而ALL用于“三者都”
第二点：如果BOTH与AND 连接的话,既可连接可数名词,也可连接不可数名词.BOTH 和BOTH OF都加名词
例如,THERE ARE MANY TREES ON BOTH SIDES OF THE ROAD；I LIKE WATER AND AIR,THEY ARE BOTH VERY IMPORTANT TO OUR LIVES.
BOTH放在系动词后,放在实意动词之前
ALL 既可修饰可数也可修饰不可数名词.例如：
ALL THE APPLE ARE IN THE CAR；ALL OF THE WATER HAS BEEN DRUNK BY ME.
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