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Given the sentence:

These are the basic security features I need in order to operate safely.

And the sentence

These are the basic security features one needs in order to operate safely.

I am 99% sure that need should be plural in one needs. If so why would it be plural (we are using the word one)?

It would not make sense to say

These are the basic security features one need in order to operate safely.

I have heard it used in singular:

One need not worry.

Why does it work in singular there but not elsewhere?

marked as duplicate by Edwin Ashworth, cobaltduck, MetaEd, NVZ, Hot Licks Mar 28 '16 at 20:37

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    "One" is a 3rd person singular pronoun. "Needs" is not the plural of "need" but the 3rd person singular of "need". – Hot Licks Mar 28 '16 at 20:37
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    i.e., 'needs' is marked to agree with a 3rd person singular subject; and 'one' is a determiner whose noun may be reduced, and it MAY imply an unknown gender: 'If one needs a book, he may find one at the library.' – AmI Mar 28 '16 at 22:12