Can someone please explain to me the use of the apostrophe? I see a lot of people using it and it, well, I have to admit, I never really focused on studying my grammar (I had a really hot English teacher!) so I do get confused on when to use it.
"John's cds are scratched" the 's meaning that the cds belong to John, yes or no?
"Johns cd's are scarched" is wrong, yes or no?
Because I saw this topic on another forum, where a guy was asking about cds with testing material on them, the title was "Demo Test CD's", shouldn't that be "demo test cds".

(Yes I am a dirty foreigner, don't flame! lol)
"John's cds are scratched" the 's meaning that the cds belong to John, yes or no?
"Johns cd's are scarched" is wrong, yes or no?
Because I saw this topic on another forum, where a guy was asking about cds with testing material on them, the title was "Demo Test CD's", shouldn't that be "demo test cds".

(Yes I am a dirty foreigner, don't flame! lol)
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