as subject (see Clauses Sentences and Phrases)
Isn’t that the woman who lives across the road from you?
The police said the accident that happened last night was unavoidable
The newspaper reported that the tiger which killed its keeper has been put down.
WARNING:
The relative pronoun is the subject of the clause.
We do not repeat the subject:
*The woman who [she] lives across the road…
*The tiger which [it] killed its keeper …
- See more at: http://learnenglish.britishcouncil.org/en/english-grammar/clause-phrase-and-sentence/verb-patterns/relative-clauses#sthash.PxADnb14.dpuf