possessive

[hela]

Dear teachers,

Would you please tell me why there is a possessive 's' after "CD" in the following sentence?

"Whose CD’s are these?"

Thanks a lot,
Hela

[Casiopea]

Dear teachers,

Would you please tell me why there is a possessive 's' after "CD" in the following sentence?

"Whose CD’s are these?"

Thanks a lot,
Hela

It's not a possessive marker. It's a plural marker. Please note,

To avoid confusion, use apostrophe -s with lower case letters when you want to express plural number, for example,

EX: The word Mississippi has many s's and many i's.

With capital letters use apostrophe -s only if there is a possibility of confusion.

EX: As on a report card are wonderful. (Confusing)
EX: A's on a report card are wonderful. (Not confusing)

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Whose CDs are these? (OK without the apostrophe)
Whose CD's are these? (OK, but the apostrophe is not necessary)

[Tdol]

Some people add it in numbers- the 1970's, but again it is unnecssary: the 1970s.

[hela]

Dear teachers,

Thanks a lot for your explanations. Now I understand why there is an "'s" after CD.

Best regards,
Hela

[Casiopea]

You're welcome. :D