A factory worker is wearing an orange hard hat while working.
A worker doesn't wear safety gear on the job.
You can either be wearing or doesn't wear.
exists e2 e1 s1 x1 x2 x3 x4.(while(e1,e2) & Actor(e2,x1) & v_work(e2) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_hat(x3) & a_hard(s1) & Theme(s1,x3) & of(x3,x4) & n_orange(x4) & n_worker(x1) & of(x1,x2) & n_factory(x2))
exists x1 x4.(n_job(x4) & -exists e1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & on(x2,x4) & n_gear(x2) & of(x2,x3) & n_safety(x3)) & n_worker(x1))