A boat captain steering a large green wheel.
A man is steering a car.
The person cannot be steering a large green wheel on a boat and be steering a car simultaneously.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_steer(e1) & n_wheel(x4) & a_green(s2) & Theme(s2,x4) & a_large(s1) & Theme(s1,x4) & (x1 = x3) & n_captain(x1) & of(x1,x2) & n_boat(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_steer(e1) & n_car(x2) & n_man(x1))