A man is using a jackhammer to work on a sidewalk.
A man uses a demolition hammer on a sidewalk.
A demolition hammer is the same as a jackhammer.
exists e1 p1 x1 x2.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(on(e2,x3) & n_sidewalk(x3) & Actor(e2,x1) & v_work(e2)) & n_jackhammer(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_sidewalk(x4) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_hammer(x2) & of(x2,x3) & n_demolition(x3) & n_man(x1))