English is my second language, so sometimes I do write/say funny things ~g~

But, possessive or apostrophes or whose/whom?
Never had any problem with that.
My opinion, apart from the rules per se, is that the confusion has something to do with first 'hearing' certain sounds and only later learning the proper rules. 'It's' and 'its' sound the same - so 'whose' and 'who's' :)

I also remember reading a book (sorry, title escapes me, author was Alan Moore) where the old form of the possessive was used:
ie, "the man's book was new" was turned into "the man his book was new"

thanks for entry - I enjoyed it, and I am looking forward to more :)