Whom vs. Who?

[Michauek]

What's the difference between these two words (subjuncive pronouns?) Who and Whom? Does "Who" refers to subject part of a sentence and "Whom" to a predicate??

e.g. This is Tom, who is 46, and live in London

This is Tom, whom you met before.

p.s. are the commas put correctly? I'm not sure...
:|
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Experience is the name everyone gives to their mistakes. Oscar Wilde
Michal. I'm an english student :-)

[Torsten]

Hi Michal,

You might want to read this who vs. whom. Let me know what you think.
Regards,
Torsten

TOEIC listening, photographs: In the kitchen

[Michauek]

I get it now. Simply, I understand it as "Whom" to be connected with the predicate of a sentence and "who" with an object, as I wrote before.I compare it with polish sentences and it seems to be quite similar. I asked because I wasn't sure. I read an english grammar book yesterday and the author wrote that "Whom" is rarely used nowadays. It was strange for me because there is a difference between these pronouns, but this exclamantion you gave seems to be complicated for me. Thx for help :-)
_________________
Experience is the name everyone gives to their mistakes. Oscar Wilde
Michal. I'm an english student :-)