A man with a jackhammer demolishing cement
A man is using a jackhammer on the sidewalk
Just because a man with a jackhammer demolishing cement, one can't assume he is using it on the sidewalk.
exists x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & n_cement(x2) & of(x2,x4) & n_demolishing(x4) & of(x2,x3) & n_jackhammer(x3) & n_man(x1))
exists e1 x1 x2 x3.(n_sidewalk(x3) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & on(x2,x3) & n_jackhammer(x2) & n_man(x1))