一、 except用於表示同類事物之間的關係，其意為"除……以外"、"除去"。

except後面可接名詞、代名詞、副詞、介係詞片語和子句等。
如：
We have an English lesson every day except Sunday.
除星期天外，我們每天有一堂英語课。(接名詞)
They all went to the park last Sunday except him.
除了他以外，上星期天他們都去公园了。(接代名詞)
He always goes to work by bike except recently.
除最近外，他一般都骑自行車上班。(接副詞)
After breakfast the students went nowhere except to school.
吃完早餐，學生們除了上學就不到别處去了。(接介係詞片語)
My father usually goes to work by bike except when it rains.
除下雨天外，我爸爸通常騎自行車上班。(接子句)

二、 except for用於表示對主要部分的肯定和對局部的否定。它不表示同類事物之間的關係。 

1. "除了……以外"。
如： 
Smith is a good man, except for his bad temper. 
史密斯除了脾氣不好外，是個好人。
The movie was good except for the ending. 
這部电影除了结尾之外都很好。

2. "除去為了……"。
如：
Mother wouldn't give him any money except for books and stationery.
除了書本和文具外，媽媽不给他任何前。
 
3. "如果不是"，"若非"。
如：
Except for you, I would pass the exam.
如果不是你，我就會通過考试。

4. "except for+名词"结構一般可以改寫成"except + that子句"。
如：
This will do except for the length. = This will do except that it is too long.
如果不是它太長的话，這會很好。
All are here except for the absence of Tina. = All are here except that Tina is absent.
除了蒂娜以外，大家都在這裡。