a man walks across the tightrope.
a man walks across the tightrope to try not to fall in a pit below.
One cannot know that  the man is trying not to fall in a pit below.
exists e1 x1 x2.(n_tightrope(x2) & across(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 p1 x1 x2 x3.(n_tightrope(x3) & Topic(e1,p1) & -exists e2 p2.(Topic(e2,p2) & Actor(e2,x1) & v_try(e2) & exists e3 x4.(in(e3,x4) & r_below(x4) & n_pit(x4) & Actor(e3,x1) & v_fall(e3))) & across(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_man(x2) & n_man(x1))