A relative clause can be used to give additional information about a noun. They are introduced by a relative pronoun like 'that', 'which', 'who', 'whose', 'where' and 'when'. For example ...

The writing portion of the English HKDSE exam, Paper 2, counts for a full 25 per cent of the entire grade. Young Post spoke to Patrick Chan of Beacon College, Alan Chan of King’s Glory Education ...