For ex - "Scientists have found one of the substances that tells genes when to activate......."
Should this be "tell" or "tells"?
Should this be "tell" or "tells"?
This should be "tell".
Verb form that goes with plural should be used with "One of".
E.g. He is one of those candidates who "have" received scholarship.
We are saying that many candidates have received scholarship and he is one of "them".
It will be incorrect to say: He is one of those candidates who "has" received scholarship.
Hope I have made sense.
