Tham khảo tài liệu 'collins cobuild student grammar part 9', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | For more material and information please visit Tai Lieu Du Hoc at That was the room where I did my homework. There are several reasons why we can t do that. Unit 93 Non-defining clauses Main points You use non-defining relative clauses to give extra information about the person or thing you are talking about. Non-defining relative clauses must be introduced by a relative pronoun such as which who whom or whose . A non-defining relative clause comes immediately after a noun and needs a main clause to make a complete sentence. 1 You use non-defining relative clauses to give extra information about the person or thing you are talking about. The information is not needed to identify that person or thing. Professor Marvin who was always early was there already. Who was always early gives extra information about Professor Marvin. This is a non-defining relative clause because it is not needed to identify the person you are talking about. We already know that you are talking about Professor Marvin. Note that in written English a non-defining relative clause is usually separated from the main clause by a comma or by two commas. I went to the cinema with Mary who I think you met. British Rail which has launched an enquiry said one coach was badly damaged. 2 You always start a non-defining relative clause with a relative pronoun. When you are talking about people you use who . Who can be the subject or object of a non-defining relative clause. Heath Robinson who died in 1944 was a graphic artist and cartoonist. I was in the same group as Janice who I like a lot. In formal English whom is sometimes used instead of who as the object of a non-defining relative clause. She was engaged to a sailor whom she had met at Dartmouth. 3 When you are talking about things you use which as the subject or object of a non-defining relative clause. I am teaching at the Selly Oak centre which is just over the road. He was a man of considerable inherited wealth which he .
