Kids sit on a ledge and talk.
The kids are sitting on a ledge.
Sit and sitting are synonyms.
exists e1 x1 x2 x3 x4.(on(e1,x2) & n_talk(x4) & n_ledge(x3) & subset_of(x4,x2) & subset_of(x3,x2) & Actor(e1,x1) & v_sit(e1) & n_kid(x1))
exists e1 x1 x2.(n_kid(x1) & on(e1,x2) & n_ledge(x2) & Actor(e1,x1) & v_sit(e1))