A construction worker overseeing someone digging with a machine.
A supervisor is watching his employee dig a hole while smoking
The fact that the construction worker is overseeing someone does not necessarily imply he is a supervisor. The fact that someone is digging with a machine does not imply that they are smoking.
exists e1 e2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e2,x4) & Actor(e2,x3) & v_oversee(e2) & with(e1,x6) & n_machine(x6) & Actor(e1,x5) & v_dig(e1) & (x4 = x5) & n_person(x4) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists x1 x3 x4.(all x2.(n_hole(x2) -> exists e1 x5.(while(e1,x5) & n_smoking(x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & for(x3,x2))) & n_dig(x3) & of(x3,x4) & n_employee(x4) & of(x3,x1) & n_male(x1) & n_supervisor(x1))