Teenage boy is riding a unicycle through a grassy park.
a boy rides a skateboard
it is either a unicycle or a skateboard
exists e1 s1 x1 x2 x3 x4.(through(e1,x4) & n_park(x4) & a_grassy(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_unicycle(x3) & n_boy(x1) & of(x1,x2) & n_teenage(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_boy(x1))