besides 除。。。之外，表示除了前面说的外还包括后面的内容，如：We went there besides you表示.你也去了except for 除。。。之外，表示补充说明前面的情况如何，对前面的内容加以补充的，一般是前面的内容是好的话，那么后面的内容一般是不好的，如：Your article is very good except for some spelling mistakes. 你的文章很好，除了有些拼写错误。

except for 和 except 的区别

1)Except后排除的内容与主语往往是同一类的,而exceptfor后所排除的内容与主语往往不是同一类的。例如,试比较:

All the buildings are excellent except this one.

All the buildings are excellent except for their location或者All the buildings are excellent except that the place on which the buid?ings are built is notgood.

2)当except用在句首时往往改用exceptfor。例如:

There was no single person in the dark street that night except apoliceman on his duty.此句相当于:

Except for apoliceman on his duty,there was no single person in the dark street that night.