As a singular numerical pronoun, we don't have trouble with one: "Those donuts look delicious; I think I'll pick this one." But what if I want two donuts? It is possible, sometimes, to pluralize one:
* I really like the chocolate ones.
* The ones with chocolate frosting have cream fillings.
* Are these the ones you want?
* Do you want these ones? WRONG!!!!
When the word "ones" is preceded by a plural determiner (like these), we usually drop the ones and the determiner turns into a demonstrative pronoun: "Do you want these?" CORRECT!!!!
Even Peter Mansbridge said this on the CBC National News!