ip4防护等级:请问except for跟except 在用法上有什么不同?

except指同类型中的“除外”
except for则表示不同类型间

比如：
Ican see all my friends here except him

I can see everting here except for my friends

except后面接的是没有的东西
except for后面接的是有的东西
例：
All of the students went to the park except me.所有人都去了，我没去
None of the students except for me went to the park.所有人都没去，我去了

except后面接的是没有的东西
except for后面接的是有的东西
例：
All of the students went to the park except me.所有人都去了，我没去
None of the students except for me went to the park.所有人都没去，我去了

except的后面接的是表示否定的意思
except for的后面接的表示的是肯定的东西
比如：
I have apples,eggs except oranges
我有、苹果 鸡蛋 但没橘子
I have oranges except for apples ,eggs
和上面的意思一样
注意比较以下

The museum is open daily except Monday.
Everyone was there except for Sally.

except表示除了...,后面接的通常是没有的东西，表示除了...没有怎样
All of them went there except me.

except for...表示整体都怎样，仅有个别
例如：The article was well written except for a few spelling mistakes.