Several people, sitting in a park on the grass, grilling.
People are cooking steaks for a picnic.
Grilling does not indicate cooking steaks.
exists e1 e2 s1 x1 x2 x3 x4.(n_grass(x4) & Actor(e2,x1) & v_grill(e2) & on(e1,x4) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_cook(e1) & for(x2,x3) & n_picnic(x3) & n_steak(x2) & n_people(x1))