except用于同类事物,其意为"除……以外"、"除去".
1.except后面可接名词、代词、动词、副词、介词短语和从句等.
We have an English lesson every day except Sunday.
除星期天外,我们每天有一堂英语课.
(接名词) (这里是every day与 Sunday是同类)　
They all went to the park last Sunday except him.
除了他以外,上星期天他们都去公园了.
(接代词)(这里They和 him.是同类)
二、except for用于表示对主要部分的肯定和对局部的否定.用于不同类事物之间的关系,其意思为：
1."除了……以外".
Smith is a good man,except for his bad temper.
史密斯除了脾气不好外,是个好人.
(a good man和bad tempe不是同类)
2."除去为了……".
Mother wouldn't give him any money except for books and stationery.
除了买书和文具外,妈妈不给他任何钱.
(money和books and stationery不是同类)