A boy in blue is riding his bike in a skate park.
The boy is on a skateboard at the skate park.
There is either a bike or a skateboard.
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & n_park(x4) & of(x4,x5) & n_skate(x5) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & of(x3,x1) & n_male(x1) & in(x1,x2) & n_blue(x2) & n_boy(x1))
exists p1 x1 x2 x3.(n_park(x2) & of(x2,x3) & n_skate(x3) & n_boy(x1) & at(p1,x2) & exists x4.(on(x1,x4) & n_skateboard(x4)))