A boy trying to climb a wall.
The boy is sitting down tying his shoes.
The boy cannot be sitting and trying to climb at the same time.
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 e2 e1 s1 x1 x2.(n_shoe(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_tie(e2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))