4 b Join the sentences using who, which, whose, when, where (where possible). Which are defining relative clauses (D) and which are non-defining (ND)?

1. Brian, who is a graphic designer, lives next door. (ND) 2. The shop where I bought my DVD player sells really up-to-date products. (D) 3. I've just bought a book which is about inventions. (D) 4. Ben, whose father is a software designer, is studying electronics. (ND) 5. Rachel, who originally trained as a teacher, won the Businesswoman of the Year Award. (ND) 6. I live in the centre of the city, which is very noisy. (ND)