Re: his/committee's
Yoong Liat wrote:1. John bumped into a friend of his yesterday.
2. The second meeting of the commitee will be held on Friday.
Why is it that in sentence 1, "his" is used, but in sentence 2, commitee is used but not commitee's?
"His" refers to John, a (male) individual. We can use "his", "hers" and "theirs" in this way when referring to things associated with or owned by people.
Jane met an old colleague of hers yesterday.
Mary and John met an old friend of theirs last week.
Strictly speaking, you can leave out "of his", "of hers" and "of theirs" without affecting the meaning of the sentences. The construction is somewhat slangy and conversational.
A committee (two 'm's, two 't's) is not a person.
You could write "The committee's second meeting will be held on Friday".