A young boy in a red hat rides on a horse.
The boy is learning to ride.
Rides a horse does not imply learning to ride.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & on(x2,x4) & n_horse(x4) & n_ride(x2) & of(x2,x3) & n_hat(x3) & a_red(s2) & Theme(s2,x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 x1.(n_boy(x1) & Topic(e1,p1) & Actor(e1,x1) & v_learn(e1) & exists e2.(Actor(e2,x1) & v_ride(e2)))