A boy attempting a jump on his bike.
A boy is on a bike.
Attempting anything on a bike implies is on a bike.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_attempt(e1) & on(x3,x4) & n_bike(x4) & of(x4,x1) & n_male(x1) & n_jump(x3) & (x1 = x2) & n_boy(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_bike(x2)) & n_boy(x1))