Which is grammatically correct?
[ol]
[li]Stephen Colebourne is perhaps one of the only people on Earth who really understands dates and times.[/li]
[li]Stephen Colebourne is perhaps one of the only people on Earth who really understand dates and times.[/li][/ol]
I’m a native English speaker, and to my ear (1) sounds more correct. I guess because he’s “one (of the people) who understands”, and “one” is singular.
But I guess he is also “one of {the people who understand}” and people is plural. So that favors (2).
And does the addition of “only” make a difference? “One (of the only people)” makes less sense to me than “of {the only people who understand}”, since “who understand” specifies what I mean by “the only people”.