People wait to board boats.
The people are at the airport waiting to board a plane.
People cannot wait to board boats and be at the airports simultaneously.
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 e1 p1 p2 x1 x2.(n_airport(x2) & n_people(x1) & for(p1,e1) & Topic(e1,p2) & Actor(e1,x1) & v_wait(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_board(e2) & n_plane(x3)) & at(x1,x2))