as a way of showing how a sentence or clause is related to what has already been said: I can’t play tennis, but neither can you.
as a conjunction with nor (connecting two words or phrases): Neither Simon nor Sally can swim. ♦ He was neither as slim nor as healthy as I was.
as a determiner (followed by a singular noun): Neither woman seemed sure of what to say.
as a pronoun: There were two witnesses, but neither would make a statement. (followed by ‘of’): ♦ Neither of us knew what to do.
When neither is the subject of a sentence, it is usually used with a singular verb: Neither of the books was published in this country. But in spoken English a plural verb is sometimes used: ♦ Neither of us are planning to go.