Write sentences using the words in bold to write defining or non-defining relative clauses. Add commas where necessary. 1 that / be / the hospital / my mum work / as a nurse 2 the helicopter paramedics / give / emergency health treatment / save / many lives 3 millions of tourists / come / from all over the world / visit / Oxford every year 4 the sales assistant / I / speak / to / give / me a refund straightaway 5 this yellow house / a famous artist / once / live / be / now / a local tourist attraction 6 my sister / know / someone / parents / be / actors