I know the basic idea of "one" and "it". "One" means "a..." and "it" means "the...". How about the sentence below? Which word would you choose?
- My son is allergic to nuts. He gets sick when he eats (one/ ones/ it/ them).
To my understanding, the correct choice is either "one" or "ones" because the sentence is not talking about particular nuts.
(The son becomes sick when he eats a nut or nuts, not the nut or the nuts.)
However, the English lesson material below says "He gets sick when he eats them."
Why is "them" used here although the sentence is not talking about particular nuts? Since this is not about particular nuts, I guess we should use "ones" here instead of "them", which corresponds to "the nuts".
Is my understanding incorrect? Why is "them" used here though it's not about particular nuts?