people looking at expensive equipment and smiling
A couple is looking at a new riding lawnmower that they like.
People does not imply a couple. There are other examples of expensive equipment other than a new riding lawnmower. People can be smiling for other reasons than that they like a piece of equipment.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & Actor(e2,x4) & v_smile(e2) & (x1 = x4) & at(e1,x3) & n_equipment(x3) & a_expensive(s1) & Theme(s1,x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_people(x1))
exists e1 e2 s1 x1 x2 x3 x4.(at(e1,x2) & Theme(e2,x4) & Actor(e2,x1) & v_like(e2) & (x2 = x4) & n_thing(x1) & n_lawnmower(x2) & of(x2,x3) & n_riding(x3) & a_new(s1) & Theme(s1,x2) & Actor(e1,x1) & v_look(e1) & n_couple(x1))