A worker uses a jackhammer on the street.
A person is using a tool.
Jackhammer is a tool.
exists e1 x1 x2 x3.(n_street(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_jackhammer(x2) & n_worker(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_tool(x2) & n_person(x1))