reflecting the distribution of the genres in the MTC ( Zeyrek et al 2009 ) . The main objective of the project is to annotate discourse connectives with their two arguments , modifiers and supplementary text spans . Following the Penn Discourse Tree Bank ( PDTB ) , we take discourse connectives as discourse-level predicates taking two ( and only two ) arguments , called Arg1 and Arg2 , which may span one or more clauses and sentences that are adjacent or nonadjacent to the connective ( Prasad et al 2007 , Webber , 2004 ) .