Animals of the world/Animals of the world's

1. Animals of the world. OK.
2. Animals of the world's. No.
3. The tire of the car. OK.
4. The tire of the car's. No.

The car tire. Good.

CJ

May I know why "A friend of Alex's" is correct but 2 and 4 aren't? Is that because of relationship?

sb70012May I know why "A friend of Alex's" is correct but 2 and 4 aren't?

It's because Alex is a person, and the world is not a person, and a car is not a person.

The grammatical pattern OF ---'S almost always goes with a person.

a friend of Jane's; an acquaintance of Professor Smith's; a roommate of Lucy's

Or with a possessiv

Thank you.What about "animals" and "world"?

sb70012 Thank you.What about "animals" and "world"?

You didn't use "animals" with an apostrophe S. See my reply above again. I added more.

CJ

CalifJim The grammatical pattern OF ---'S almost always goes with a person.

Thank you. Would you please have look at this link post #44?
http://forum.wordreference.com/showthread.php?t=393512&page=3

One native English speaker in post #44 has

sb70012One native English speaker in post #44 has said "a cup of water's"

That was a very, very bad example. In my opinion the writer was not very good at explaining, and I think he just confused everybody by using "a cup of water's", which is wrong, because he couldn't think of a proper example. In your place, I would ignore that post.

CJ