A construction worker walks down the street.
A doctor drives to work.
The two sentences are not describing the same people. A construction worker is walking down the street, but then it talks about a doctor who is driving to work.
exists e1 x1 x2 x3.(n_street(x3) & down(e1,x3) & Actor(e1,x1) & v_walk(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists x1 x2 x3.(a_topic(x1) & to(x1,x3) & n_work(x3) & n_drive(x1) & of(x1,x2) & n_doctor(x2))