Adjective Clauses
Relative Pronouns
Pronoun
who
Refers to
Example
a subject noun a person The woman
who(m)
who called you is here.
an object noun a person The woman whom you met is here.
that
a subject or object noun a person or thing The telephone that is red is here.
which
a subject or object noun a thing The telephone which is yours is here.
Wrong*
* The telephone is here which is yours.
Wrong because the pronoun must be next to the word it modifies. Only an object pronoun can be omitted.
Pronoun
Refers to
Object Pronoun May be Omitted
who(m)
an object noun
The woman [whom] you met is here.
that
an object noun
The telephone [that] you bought is here.
which
an object noun
The telephone [which] you bought is here.