Three people stand in front of a river by a city while one throws something into it.
The body of water that is shown is the Mississippi River.
The fact that a river is by a city doesn't imply it is the Mississippi River.
exists e1 p1 x1 x2 x3 x4.(exists e2 x5 x6.(into(e2,x1) & Theme(e2,x6) & Actor(e2,x5) & v_throw(e2) & n_thing(x6) & n_thing(x5) & card_eq_1(x5)) & n_thing(x1) & while(e1,p1) & in(e1,x2) & by(x2,x4) & n_city(x4) & of(x2,x3) & n_river(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_3(x1))
exists e1 p1 x1 x2 x3 x4 x5.(ne_geo_river(x4) & (x4 = x5) & ne_geo_mississippi(x5) & n_body(x1) & (x1 = x4) & Theme(e1,x3) & v_show(e1) & (x1 = x3) & of(x1,x2) & n_water(x2))