An off road vehicle climbs over a dirt hill.
Someone is driving.
an off road vehicle climbing does not infer someone is driving.
exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & off(x1,x2) & over(x2,x5) & n_hill(x5) & of(x5,x6) & n_dirt(x6) & n_climb(x2) & of(x2,x4) & n_vehicle(x4) & of(x2,x3) & n_road(x3) & n_an(x1))
exists e1 x1.(Actor(e1,x1) & v_drive(e1) & n_person(x1))