A worker in an orange vest is using a shovel.
A possible construction worker in an orange vest is using a shovel on the ditch.
A worker in an orange vest does not necessarily mean the he is a construction worker.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_use(e1) & n_shovel(x4) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_worker(x1))
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_ditch(x6) & Theme(e1,x5) & Actor(e1,x1) & v_use(e1) & on(x5,x6) & n_shovel(x5) & in(x1,x3) & n_vest(x3) & of(x3,x4) & n_orange(x4) & n_worker(x1) & of(x1,x2) & n_construction(x2) & a_possible(s1) & Theme(s1,x1))