Do we have to use s (third person singular) for a verb which follows one?

Ex. From the following equation, one obtains/obtain . . . . . .

Is one considered a third person singular here? Which part of speech is one? Is it pronoun?

Thanks for your time and help
Yes, it takes an "s". One writes, one runs, one sleeps.

It is a pronoun.


Thanks for your response, but I have seen one followed by a verb without having an S at the end.

I thought both might be correct.

Let's see what others say

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In an indicative statement, use the 's' form, as previously noted..

Perhaps you are thinking of the subjunctive, eg 'I suggest that one arrive on time'. This kind of thing is rarely said.

Thanks for your reply

So if one is followed by indicative verb s form should be used and for subjunctive verb s is not needed.

Would you please give more examples of two forms?

Thank you very much for your time and help

I'd rather you try to write a few sentences now.

But note that the subjunctive is not used a lot.

And the pronoun 'one' is not used a lot in American English.

In British English, 'one' is one of those features that mark the speaker as probably well-educated.

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