How should I explain the difference between "one" and "it" as following example Ex.1 I want a CD player, but I don't have money to buy "ONE". Ex.2 I want this CD player, but I don't have money to buy "IT". Ex.3 This blue watch is better than my old "ONE". I do know when I should use "one" and when I should use "it", but the problem I'm having now is that I can't really explain it well. Here is my explaination: "One" is used to replace the noun mentioned earlier in the context. Every none specific noun can be replaced. Ex.1 for instance, I just want a CD player i don't care what color it is or where it's from. It's not specific. In Chinese it's called "非限定" In Ex.2 "it" means a specific noun. What I want is this specific CD player. In Chinese it's called "限定". Ex. 3 is exactly what confuses me now. Since "my old watch" is a specific thing why we use "one" to replace it instead of "it"? Could someone please help me? --

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