boy on bike jumping over a sign
The boy is trying to jump higher than his friends.
The fact that a boy on a bike is jumping over a sign doesn't imply boy is trying to jump higher than his friends.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & over(e1,x4) & n_sign(x4) & Actor(e1,x3) & v_jump(e1) & (x2 = x3) & n_bike(x2) & n_boy(x1))
exists e1 p1 x1 x2.(n_friend(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 s1.(for(e2,s1) & than(s1,x2) & r_more(s1) & Theme(s1,x1) & a_higher(s1) & Actor(e2,x1) & v_jump(e2)))