What is the rule on which I can choose the right verb? I find difficult to determine whether the verb refers back to a singular or plural subject. Here some question to clearify it much more:
One of the people who (know/knows) a lot .
It's you who (is /are) reponsible for students.
It (is /are) you the director.
one of these people: the people who know a lot So: one of the people who know a lot you are re s ponsible So: It's you who are responsible ... It (is /are) you the director . Ungrammatical no matter which choice you make.
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one of these people: the people who know a lot
So: one of the people who know a lot
you are responsible
So: It's you who are responsible ...
It (is /are) you the director.
Ungrammatical no matter which choice you make.
CJ