>One of my students wants to know how Benicio Del Toro can be >nominated for Best Supporting Actor by the Oscar nominators, but for >Best Actor by the Screen Actors Guild, for the same performance.

Check the rules.

http://www3.oscars.org/73academyawards/73rules/intro.html
http://www.sagawards.org/rules_rules.html

----
For past messages, visit the Screen-L Archives:
http://bama.ua.edu/archives/screen-l.html