There is a ballet dancer jumping in the air.
A boy is playing.
Ballet dancer is not gender specific and ambiguous, same goes for the word playing, and jumping is definitive.
exists p1 x1 x5.(n_air(x5) & exists e1 x2 x3 x4.((x1 = x2) & in(e1,x5) & Actor(e1,x4) & v_jump(e1) & (x2 = x4) & n_dancer(x2) & of(x2,x3) & n_ballet(x3)))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_boy(x1))