We can use relative clauses to join two English sentences, or to give more information about something. • I bought a new car. It is very fast. → I bought a new car that is very fast . • She lives in New York. She likes living in New York. → She lives in New York, which she likes . A defining relative clause tells which noun we are talking about: I like the woman who lives next door. (If I don't say 'who lives next door', then we don't know which woman I mean). A non-defining relative clause gives us extra information about something. We don't need this information to understand the sentence. I live in London, which has some fantastic parks. (Everybody knows where London is, so 'which has some fantastic parks' is extra information). 1: The relative pronoun is the subject: We can use 'who', 'which' or 'that'. We use 'who' for people and 'which' for things. We can use 'that' for people or things. For examp...