except/except for/except that/except when 的区别
（1）except表示“除去,不包括”,强调所排除的“不包括在内”,一般表示同类之间的关系,常同nothing,all,none,nobody,any等不定代词以及every连用.except 经常接名词或代词,但也可接副词,介词短语,例如：
① The office is open every day except Sundays.除了星期日这家公司每天都营业.
② You can have any of the cakes except this one.除了这块蛋糕,你哪块都能吃.
③ She saw nothing except snow.除了雪她什么也没看见.（nothing except = nothing but = only）
（2）except经常接名词、代词,也可接副词,介词短语,不带to的不定式或从句等.例如：
④ She looked everywhere except here.除了这里,她到处看.
⑤ You may drop in at any time except at noon.除了中午,你任何时候来都可以.
⑥ She doesn’t do anything except sit and watch TV.除了坐着看电视外,她什么也不做.
⑦ It was a good hotel except that it was rather noisy.这家旅馆还不错,只可惜吵.
⑧ He usually goes to work by bicycle except when it rains.除了下雨的时候,他通常骑自行车去上班.
（3）except for也表示“除…以外”,指对某种基本情况进行具体的细节方面的修正.它同except的区别是：except for后接的词同句子中的整体词（主语）不是同类的,指从整体中除去一个细节,一个方面；而except后接的词同整体词（主语）一般是同类,指在同类的整体中除去一个部分.例如:
⑨ I can answer all the questions except for the last one.除了最后一题外,所有题目我都可以解答.
⑩ Your writing is good except for a few grammar mistakes.除了几处语法错误外,你的作文写得很好.