Relative clauses (betrekkelijke bijzinnen) give information about a noun (phrase)-the so called ‘antecedent’- in the main clause. The main clause is linked to the relative clause by means of a relative pronoun (who, which, that, whose, or a zero pronoun )
antecedent is human antecedent is non-human
subject who/that that/which
She is the girl who turned down her boyfriend. Play the CD that lies on the table.
She is the girl that turned down her boyfriend. Play the CD which lies on the table.
object who/that/zero that/which/zero
He is the guy (zero) she turned down. Was this the CD (zero) you needed?
He is the guy that she turned down. Was this the CD that you needed?
He is the guy who she turned down. Was this the CD which you needed?
prep.object who/that/zero +… +prep that/which/zero
Is this the guy (zero) she broke up with. Is this the CD (zero) you were listening to?
Is this the guy that she broke up with. Is this the CD that you were listening to?
Is this the guy who she broke up with. Is this the CD which you were listening to?
possessive whose whose/of which
This is the girl whose boyfriend was arrested. The CD of which the surface is scratched is bad.
1.NEVER omit who/that/which , when the relative pronoun is subject of the relative clause!
2.NEVER use who when the antecedent is an animal or thing. (Not: The bus who had to pick up the children)
3.Note the spelling of which.