A group of people sitting on a pier.
People are fishing.
Sentence 1 is missing people fishing
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & on(e1,x4) & n_pier(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1.(Actor(e1,x1) & v_fish(e1) & n_people(x1))