People wait to board boats.
People are going on a whale watching tour.
People boarding boats do not necessarily be going on a whale watching tour
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_board(e2) & n_boat(x2)) & n_people(x1))
exists e2 e1 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & n_tour(x3) & on(e1,x2) & n_whale(x2) & Actor(e1,x1) & v_go(e1) & n_people(x1))