UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈniːðər/, /ˈnaɪðər/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈniðɚ, ˈnaɪ-/ ,USA pronunciation: respelling(nēᵺər, nī-)

WordReference Collins English Usage © 2020
‘neither’ and ‘neither of’
You use neither or neither of to make a negative statement about two people or things. You use neither in front of the singular form of a countable noun. You use neither of in front of a plural pronoun or a plural noun phrase beginning with the, these, those, or a possessive.
So, for example, you can say ‘Neither child was hurt’ or ‘Neither of the children was hurt’. There is no difference in meaning.
Neither man spoke or moved.
Neither of them spoke for several moments.
Be careful
Don't use ‘neither’ without of in front of a plural form. Don't say, for example, ‘Neither the children was hurt’. Also, don't use ‘not’ after neither. Don't say, for example, ‘Neither of the children wasn’t hurt'.
People sometimes use a plural form of a verb after neither of and a noun phrase. For example, they say ‘Neither of the children were hurt’.
Neither of them are students.
Neither of them were listening.
This use is acceptable in conversation and in less formal writing, but in formal writing you should always use a singular form of a verb after neither of.
‘neither’ in replies
When a negative statement has been made, you can use neither to show that this statement also applies to another person or thing. You put neither at the beginning of the clause, followed by an auxiliary verb, a modal, or be, then the subject. You can also use nor in the same way with the same meaning.
‘I didn’t invite them.' – ‘Neither did I.’
If your printer does not work, neither will your fax or copier.
Douglas can't do it, and nor can Gavin.
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