except 和except for的区别是什么

except表示“从所提到的人或事物中除去,即从整体中除去一部分”,表示递减的概念,含义是否定的.
We all went except him.
除他之外,我们都去了.(他没有去)
except for主要有三层含义：
①表示对整体主要部分的肯定和对局部的否定起部分修正主要意思的作用.
eg.Your composition is quite excellent except for several spelling mistakes.
②表示非同类事物进行比较.
eg.The street is empty except for several cars.
③置于句首,表达except的含义.
eg.Except for thiseverything is in order.
except for后接名(代)词可以转移为except＋从句或其他介词短语.
eg.The climate here is good except for some rainy days.(except when it rains；except that it sometimes rains；except on the rainy days)
注意：二者用于否定句时含义相同,意思是一样的.
eg. He did nothing besides (＝except) this.
除这件事外,他什么事也没做.
从形式上看,except后面不仅可以接短语,还可以接that引导的从句,而except for后面只能接名词短语.