... define a tree adjoining grammar as follows. A tree adjoining grammar G is a paw (i,A) where i is a set of initial trees, and A is a set of auxiliary trees. A tree a ls an initial tree if it ... beDeflt~l enormously I:y v*/uablo di~*eo~iotc with them. 82 2. TREE ADJOINING GRAMMARS TAG's We now introduce tree adjoining grammars (TAG's). TAG's are more powerful than CFG's, ... 1975 " ;Tree adjoining gramm=rs', Jo, rual of Comout~r ~"~'ems and Sc.;enees March 1975 5. Kroch, T, and Joshi, A.K., I~85 °Linguistic relevance of tree adjoining grammars& apos;,...