Two people are on top of the bed of a truck.
The truck is moving.
Not all truck with people on top of it are moving.
exists p1 x1 x3.(n_bed(x3) & exists x2 x4.(on(x1,x2) & of(x2,x3) & of(x3,x4) & n_truck(x4) & n_top(x2)) & n_people(x1) & card_eq_2(x1))
exists e1 x1.(n_truck(x1) & Actor(e1,x1) & v_move(e1))