A person wearing a helmet is racing in a car.
A person is sitting still in a car.
If the person is racing then they aren't sitting still.
exists e1 e2 x1 x2 x3 x4.(in(e2,x4) & n_car(x4) & Actor(e2,x1) & v_race(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & (x1 = x2) & n_person(x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_car(x2) & a_still(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_person(x1))