A boy trying to climb a wall.
A boy is climbing.
The boy tries to climb then does it
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_try(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_climb(e2) & n_wall(x3)) & (x1 = x2) & n_boy(x1))
exists e1 x1.(Actor(e1,x1) & v_climb(e1) & n_boy(x1))