A man driving a four-wheeler off-road.
A man driving a vehicle.
A four-wheeler is a vehicle for off-road driving.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & n_off-road(x3) & a_four-wheeler(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & n_vehicle(x3) & (x1 = x2) & n_man(x1))