odyssey wrote:I'm sorry that it's you that has to tell her.
Every time. Singular or plural.
Except when the relative pronoun (who
) is a plural subject pronoun and relates to a plural subject.
Thus, in addressing a crowd:
I'm sorry that it's you that have
to tell her.
being the subject, and not you
is incorrect in your example, and should be who
...Murphy (1990); Eastwood (1992)