A black worker sawing a pipe.
the worker is sawing
The worker is black and sawing a pipe.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_saw(e1) & n_pipe(x3) & (x1 = x2) & n_worker(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1.(n_worker(x1) & Actor(e1,x1) & v_saw(e1))