TASK DEFINITION: In this task, you are given two sentences in the English language and your task is to classify them into one of their discourse types. A discourse type is an indicator to classify the given two sentences on the basis of a co-text as well as a relevant context. There are 13 discourse types in total which are 'SINGLE_S_COORD', 'SINGLE_CATAPHORA', 'SINGLE_CONN_INNER', 'SINGLE_APPOSITION', 'SINGLE_VP_COORD', 'SINGLE_CONN_START', 'PAIR_ANAPHORA', 'PAIR_CONN', 'SINGLE_RELATIVE', 'SINGLE_CONN_INNER_ANAPHORA', 'SINGLE_S_COORD_ANAPHORA', 'PAIR_CONN_ANAPHORA' and 'PAIR_NONE'.
PROBLEM: Sentence 1:The building was completed in 1970 and AA employees moved in at that point , and it was officially opened by Queen Elizabeth in 1973 . Sentence 2:nan

SOLUTION: SINGLE_S_COORD_ANAPHORA

PROBLEM: Sentence 1:Although Bolton worked mostly in the West End in the 1930s , his biggest hit of the decade began on Broadway , a collaboration with his old friend Wodehouse , who had by then largely abandoned the theatre for novel - writing . Sentence 2:nan

SOLUTION: SINGLE_CONN_START

PROBLEM: Sentence 1:Delilah 's cousin Chas Dingle ( Lucy Pargeter ) , a barmaid at the Woolpack pub , saw David with Katie Sugden ( Sammy Winward ) . Sentence 2:nan

SOLUTION:
SINGLE_APPOSITION