except 和except for有什么区别吗?请详细说明并举例,

except后面就加和前面相同类型的：例如：There is nothing in the room except a table。There is nobody in the room except WangYongXian。except for后面就加和前面不相同类型的：例如：There is nothing in the room except for WangYongXian。There is nobody in the room except for a table。就是这样,相信你会明白的．