500
Is the capitalized part of the sentence an appositive? If so, what does it modify? If not, why not?
We looked all over for the camp counselor, Mr. Macdonald, A BEARDED MAN WHO SHOULD'VE BEEN HARD TO MISS.
Yes, it describes Mr. Macdonald. When it says "man," that is a noun used to described another noun, Mr. Macdonald.