A red-haired girl is jumping in the air with a skateboard near her feet.
The girl is not on the ground.
If someone is not on the ground, then they must be in the air.
exists e1 s1 x1 x2 x3 x4.(n_foot(x4) & of(x4,x2) & n_female(x2) & n_air(x2) & with(e1,x3) & near(x3,x4) & n_skateboard(x3) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1) & a_red-haired(s1) & Theme(s1,x1))
exists x1 x2.(n_ground(x2) & n_girl(x1) & -exists p1.on(x1,x2))