A man is walking on a sidewalk that is under construction.
a man is walking on a sidewalk
A man walking on a sidewalk is a sidewalk.
exists e1 p1 x1 x2 x3.(on(e1,x2) & exists x4.(under(x3,x4) & n_construction(x4)) & (x2 = x3) & n_sidewalk(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2.(on(e1,x2) & n_sidewalk(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))