| Can I explain, that when there is a choice and the noun is
already mentioned, it doesn't need to be mentioned again? |
|
That seems an acceptable informal explanation if you don't want to get
into a lot of grammatical terminology with the students. But
instead of saying that it doesn't have to be mentioned again, you might
say that it must be represented again somehow, and the word
one is how we represent it again without repeating the exact same word or words.
However, note that
one does not actually replace the single
noun; it replaces the noun and its complements, if any. Radford
gives these examples, of which the first is correct, but not the second.
The present king of England is more popular than the last one. (
one replaces
king of England.)
*The king of England defeated the one of Spain. (
one replaces just
king.)
In the language of transformational grammar, it is said that
one replaces an N-bar, not just an N.
I doubt that it will be necessary or advisable to explain the concepts in this much detail for your students.
CJ