Is "For Whom the Bell Tolls" correct? Is this the correct usage of "whom?"
For those who object that subjects and objects are not their subject, there is an even easier way to get this right: if you can replace the "who" or "whom" with "he/she/they" then it should be "who"; if you can replace it with "him/her/them" then you want "whom". The bell tolls for him/her/them, so it's "whom"; he/she/they don't know the difference, so it's "who".
http://www.theguardian.com/media/mind-your-language/2011/aug/15/mind-your-language-who-whom
Simplified rule:
http://www.dianewordsmith.com/the-write-stuff-blog/for-whom-the-grammar-bell-tolls
You should be a tutor, instead of lazing around!