A person in a helmet rides a four-wheel vehicle in the desert.
A person wearing goggles is out int he desert.
Not all people riding a four-wheel vehicle wear googles. Just because a person wears a helmet does not mean he or she will wear goggles.
exists e1 s1 x1 x2 x3 x4.(n_desert(x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & in(x3,x4) & n_vehicle(x3) & a_four-wheel(s1) & Theme(s1,x3) & in(x1,x2) & n_helmet(x2) & n_person(x1))
exists e1 e2 p1 x1 x2 x3.(r_out(e2) & exists e3.(Actor(e3,x1) & v_desert(e3)) & n_male(x1) & Topic(e2,p1) & Actor(e2,x1) & v_int(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_goggles(x3) & (x1 = x2) & n_person(x1))