A boy on a bike jumping.
Boy jumps off a bike ramp
The boy is not necessarily jumping off a bike ramp.
exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & Actor(e1,x3) & v_jump(e1) & (x2 = x3) & n_bike(x2) & n_boy(x1))
exists e1 s1 x1 x2 x3.(ne_nam_boy(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_ramp(x2) & of(x2,x3) & n_bike(x3))