beside 、 besides 、 expect的区别?

eside 介词在。。。的旁边eg。I sit beside my good friend,Jack。besides 介词 除了。。。以外还有I have two more caps besides this one。except介词 除了。。。以外没有 Aii of our classmates went to the cinema except Tomexpect是动词,期待。I expect that my parents will come to see me this week。