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.

besides表示“除了……之外,还有……”,指“在整体中加入一部分”,表示递加的概念,含义是肯定的.

①We all went except him.除他之外,我们都去了.(他没有去)

②We all went besides him.除他之外,我们大家也都去了.(他也去了)

eg.He had other people to take care of besides me.

All the students in Class One went to the cinema except Li Ping.

(2)若句中没有实义动词do的某种形式,except后接动词不定式,而besides后接动词的-ing形式.

except后面的范围比主语的范围小，除去的和非除去的是同类事物。besides指更进一步的拥有，包括所“除”事物在内。

举例：All the students went to see the film except Tom.

All the students went to see the film besides Tom.