A young girl rides horseback.
The young person is learning how to ride a horse.
Just because the young girl rides horseback doesn't mean that she is learning how to ride a horse.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horseback(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_person(x1) & a_young(s1) & Theme(s1,x1) & Topic(e1,x2) & Actor(e1,x1) & v_learn(e1) & n_manner(x2) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_ride(e2) & n_horse(x4)))