A surfer being towed by a boat has hit a wave.
A person on a skateboard is being towed by a car.
A surfer and a person on a skateboard are two different people. One cannot be surfing and skateboarding simultaneously. A boat and a car are two different vehicles.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_hit(e2) & n_wave(x4) & Actor(e1,x3) & n_boat(x3) & Theme(e1,x2) & v_tow(e1) & (x1 = x2) & n_surfer(x1))
exists e1 x1 x2 x3.(Actor(e1,x3) & n_car(x3) & Theme(e1,x1) & v_tow(e1) & on(x1,x2) & n_skateboard(x2) & n_person(x1))