A man making cement risers.
a man makes cement risers for a building
The fact that a man is making cement risers doesn't imply that it is for a building.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_make(e1) & n_riser(x3) & of(x3,x4) & n_cement(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & for(x2,x4) & n_building(x4) & n_riser(x2) & of(x2,x3) & n_cement(x3) & n_man(x1))