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.