A motorcyclist on a green bike is airborne.
A person is on a motorcycle.
To go airborne on a motorcycle, one must be riding the motorcycle.
exists s1 s2 x1 x2.(Theme(s2,x1) & a_airborne(s2) & on(x1,x2) & n_bike(x2) & a_green(s1) & Theme(s1,x2) & n_motorcyclist(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_motorcycle(x2)) & n_person(x1))