Some people are waiting at the subway station.
The people are waiting for a plane.
A plane and he subway are different means of transportation.
exists e1 x1 x2 x3.(n_station(x2) & of(x2,x3) & n_subway(x3) & at(e1,x2) & Actor(e1,x1) & v_wait(e1) & n_people(x1))
exists e1 x1 x2.(n_people(x1) & for(e1,x2) & n_plane(x2) & Actor(e1,x1) & v_wait(e1))