a person in midair doing a back flip.
The person is standing on the ground.
It is impossible to be in midair while standing on the ground.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_flip(x4) & a_back(s1) & Theme(s1,x4) & (x1 = x3) & in(x1,x2) & n_midair(x2) & n_person(x1))
exists e1 x1 x2.(n_ground(x2) & n_person(x1) & on(e1,x2) & Actor(e1,x1) & v_stand(e1))