a man walks across the tightrope.
A man walks across a tightrope high above the canyon.
a man walks across the tightrope does not imply he is high above the canyon.
exists e1 x1 x2.(n_tightrope(x2) & across(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_canyon(x3) & r_high(e1) & above(e1,x3) & across(e1,x2) & n_tightrope(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))