The Relative Pronouns Whom/Which/That
Follow the same rules for using who(m), which,
and that, as you do with other
relative pronouns. The only difference
is that now these pronouns are functioning
movie that we saw last night was terrible.
--The movie, which
we saw last night, was terrible.
people, you will use either who
or whom. Who is usually
used instead of whom in colloquial
speech, even though it is technically
person who they saw was sick. (informal)
--The person whom they saw was sick. (formal)
--There's the driver who the police arrested.
driver whom the police arrested. (formal)