Considering that I have understood your questions correctly [:)], these are the examples:
- I can choose any one Entrée - fish or chicken. I can have either of them.
- Jane has two sisters. She stays with neither of them.
I think he was asking about which verb (singular or plural) to use.
so to follow up w/ your example:
I can choose any one entree: fish or chicken. either [of them] is
Jane has two sisters. Neither is
You wouldn't say "Neither are
attractive" even though it seems like you want to refer to both sisters...
think of it this way:
Neither [of the sisters] is attractive. Neither (or either) is the pronoun that always commands a singular verb. "of the sister" is just a middle-man (prepositional phrase).
kudos if you like me (or my post)