Except 含有“除…之外”或“除了”的意思时,通常用作介词而不是连词.人称代词用于except 之后时通常用宾格：
No one except me knew it.
除我之外没人知道它；
Every member of the original cast was signed except her.
除她之外的原班演员都是签约雇佣的
except 表示除了,最普遍
Except him,we are all here.
除了他我们都来了
except for 表示除了以外,还有也是
如Except for him,I am also a student.
除了他,我也是学生（两个都是）
except for
adv.
除...以外
besides用做除了以外=except for
如：
What has he done,besides reading the paper?
除了看报,他还做了什么?
不过这个词更常见是用做副词
如：
Besides,I want you to promise me one thing.
此外,我要你答应我一件事.
but说起来比较口语话,没except正式,意思同except
Nobody is here but me.
除了我没人在这.
except that 后跟从句