How do you determine when to use the genitive case with a participle and when not to?
Here are two examples based on my understanding of the Chicago Manual of Style (which is at my office, so I cannot quote directly
).
"He was impressed by Charles's having been there."
Note the genitive case in the word "Charles."
vs.
"He was happy to see Carrie reading the book."
I imagine
"He was impressed by Carrie's reading of the book" would be correct with "Carrie" in the genitive, but I don't really understand why, and often I cannot tell when to use the genitive with a participle and when not to.
Help, please. Thanks.