A man struggles to climb a rock wall.
There is a man on a rock wall.
A man struggles to climb a rock wall requires that the man is on the rock wall.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_struggle(e1) & exists e2 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_climb(e2) & n_wall(x2) & of(x2,x3) & n_rock(x3)) & n_man(x1))
exists p1 x1 x2 x3.(on(p1,x2) & n_wall(x2) & of(x2,x3) & n_rock(x3) & exists x4.((x1 = x4) & n_man(x4)))