Some firefighters check a vehicle.
Firefighters are looking for a cat in the car.
The firefighters are not necessarily looking for a cat, they could be looking for anything.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_check(e1) & n_vehicle(x2) & n_firefighter(x1))
exists e1 x1 x2 x3.(n_car(x3) & for(e1,x2) & in(x2,x3) & n_cat(x2) & Actor(e1,x1) & v_look(e1) & n_firefighter(x1))