Senses
除了 except
Introduces something that is excluded from the rest of the statement; often used with words like 都 or 全
除了 besides
Introduces something that is added to the rest of the statement, meaning "in addition to"; often used with words like 还 or 也
除了 either ... or ...
Used to introduce one of two habitual or recurring alternatives in the pattern 除了...就是...