Quote:You should always use the possessive case for any noun or pronoun which acts an an adjective. That would be one which implicitly or explicitly modifies another element in the sentence.
Quote=Piffka's
Good idea, and yet, even here, there are exceptions which I only recently learned.
Consider these two sentences:
"Jim was proud of Carlos's making the dean's list."
"Making" is a gerund modified by "Carlos"; hence "Carlos" is in the possessive.
vs.
"Jim was pround of Carlos, his oldest son, making the dean's list."
When the noun modifying the gerund is also modified--"his oldest son"--the possessive is not inflected.
I was surprised by this one!
Thanks for your comments.