... for months. (1 ) A policeman, John Mc Lane, is waiting for me at the police station. (2 ) In (1 ), Anna and my next door neighbour are co-referential and similar to each other. In (2 ), A policeman ... and an antecedent noun phrase.” (A comprehensive grammar of the English language, Quirk et al, 1985). However, (1 ) and (4 ) differ from each other in which in (1 ) there is no relative pronoun ... now in the headmaster’s office. (a) A student is now in the headmaster’s office. (a1) John Johnson is now in the headmaster’s office. (a2) The apposition in (a) fulfils all three criteria required...