A skateboard is sideways in the air.
There is a skateboard in the air.
A skateboard in the air may be going sideways.
exists p1 s1 x1 x2.(n_air(x2) & a_sideways(s1) & Manner(p1,s1) & in(x1,x2) & n_skateboard(x1))
exists p1 x1 x3.(n_air(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_skateboard(x2)))