Little boy rides around playground on a motorized bike.
Boy rides around the playground on a scooter.
The boy may not be little and a scooter isn't a motorized bike.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & around(x1,x3) & on(x3,x4) & n_bike(x4) & Theme(e1,x4) & v_motorize(e1) & n_playground(x3) & n_ride(x1) & of(x1,x2) & n_boy(x2) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_playground(x2) & ne_nam_boy(x1) & around(e1,x2) & on(x2,x3) & n_scooter(x3) & Actor(e1,x1) & v_ride(e1))