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1. 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.

2. 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).
   • 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. The relative clause can come after the subject or the object of the sentence. We can't drop the relative pronoun.
       • For example (clause after the object of the sentence): I'm looking for a secretary who / that can use a computer well. She has a son who / that is a doctor.
       • clause after the subject of the sentence): The people who / that live on the island are very friendly. The man who / that phoned is my brother.
   • The relative pronoun is the object:
     • In this case we can drop the relative pronoun if we want to. Again, the clause can come after the subject or the object of the sentence
       • (Clause after the object) She loves the chocolate (which / that) I bought. We went to the village (which / that) Lucy recommended.
       • (Clause after the subject) The bike (which / that) I loved was stolen. The university (which / that) she likes is famous.

3. 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).
   • We don't use 'that' in non-defining relative clauses, so we need to use 'which' if the pronoun refers to a thing, and 'who' if it refers to a person. We can't drop the relative pronoun in this kind of clause, even if the relative pronoun is the subject of the clause.
     • (Clause comes after the subject) My boss, who is very nice, lives in Manchester. My sister, who I live with, knows a lot about cars.
     • (Clause comes after the object) Yesterday I called our friend Julie, who lives in New York. The photographer called to the Queen, who looked annoyed.

4. Prepositions and relative clauses

   • If the verb in the relative clause needs a preposition, we put it at the end of the clause:
     • LISTEN TO
       • The music is good. Julie listens to the music. → The music (which / that) Julie listens to is good.
     • WORK WITH
       • My brother met a woman. I used to work with the woman. → My brother met a woman (who / that) I used to work with.
     • GO TO
       • The country is very hot. He went to the country. → The country (which / that) he went to is very hot.
     • COME FROM
       • I visited the city. John comes from the city. → I visited the city (that / which) John comes from.
     • APPLY FOR
       • The job is well paid. She applied for the job. → The job (which / that) she applied for is well paid.
     • Whose
       • 'Whose' is always the subject of the relative clause and can't be left out. It replaces a possessive. It can be used for people and things.
         • The dog is over there. The dog's / its owner lives next door. → The dog whose owner lives next door is over there.
     • Where / when / why
       • We can sometimes use these question words instead of relative pronouns and prepositions.
         • I live in a city. I study in the city. → I live in the city where I study. → I live in the city that / which I study in. → I live in the city in which I study.