A man in a respiration mask working.
man allergic to chemicals
Just because a man is in a respiration mask working it does not mean the man is allergic to chemicals.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Actor(e1,x4) & v_work(e1) & (x1 = x4) & in(x1,x2) & n_mask(x2) & of(x2,x3) & n_respiration(x3) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & to(x1,x3) & n_chemical(x3) & n_allergic(x1) & of(x1,x2) & n_man(x2))