A man is waving as he is crossing the street.
The man can not let go of his walker for fear he will fall.
the man cannot be holding a walker and waving at the same time.
exists e1 p1 x1 x2.(n_street(x2) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_cross(e2)) & n_male(x1) & as(e1,p1) & Actor(e1,x1) & v_wave(e1) & n_man(x1))
exists x1 x3.(n_male(x1) & n_male(x1) & n_walker(x3) & of(x3,x1) & n_man(x1) & -exists e1 p1.(exists e2 p2 x2 x4.(for(e2,x4) & exists e3.(Actor(e3,x1) & v_fall(e3)) & Topic(x4,p2) & n_fear(x4) & Theme(e2,x2) & Actor(e2,x1) & v_let(e2) & of(x2,x3) & n_go(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1)))