A worker uses a jackhammer on the street.
A worker is using a jackhammer in the morning.
A worker with a jackhammer is not necessarily working in the morning. A jackhammer can be used at any time of the day or night.
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 x3.(n_morning(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_jackhammer(x2) & n_worker(x1))