a small girl jumping off on a barrier.
A boy is sitting on a barrier.
A boy cannot also be a girl. Also you cannot be jumping and sitting on a barrier at the same time.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_barrier(x3) & a_off(s2) & Manner(e1,s2) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_girl(x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_barrier(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))