Young people sit on the rocks beside their recreational vehicle.
Humans are outdoors.
people refers to humans.
exists e1 s1 s2 x1 x2 x3.(n_vehicle(x3) & a_recreational(s2) & Theme(s2,x3) & of(x3,x2) & n_thing(x2) & n_rock(x2) & beside(e1,x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(ne_nam_humans(x1) & exists x2.((x1 = x2) & n_outdoors(x2)))