The biker is riding through the woods.
A child skateboards in the woods.
The biker is riding.  The biker is not a child with skateboards.
exists e1 x1 x2.(n_wood(x2) & n_biker(x1) & through(e1,x2) & Actor(e1,x1) & v_ride(e1))
exists x1 x2 x3.(n_wood(x3) & a_topic(x1) & in(x1,x3) & n_skateboard(x1) & of(x1,x2) & n_child(x2))