A skier is airborne in front of a tree.
A person is skiing.
Typically skiing involves making jumps on a mountain, where trees are found.
exists s1 x1 x2 x3.(in(s1,x2) & of(x2,x3) & n_tree(x3) & n_front(x2) & Theme(s1,x1) & a_airborne(s1) & n_skier(x1))
exists p1 x1.(exists x2.((x1 = x2) & n_skiing(x2)) & n_person(x1))