A boy swings in the air.
a boy is swinging
The boy has to be outside to be swinging in the air
exists x1 x2 x3.(n_air(x3) & a_topic(x1) & in(x1,x3) & n_swing(x1) & of(x1,x2) & n_boy(x2))
exists e1 x1.(Actor(e1,x1) & v_swing(e1) & n_boy(x1))