A man talks on a cellphone while working.
A man is talking on a phone.
A cellphone is a type of phone, so if the man is talking on a cellphone it entails that he is talking on a phone.
exists s1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x3) & Theme(s1,x4) & a_work(s1) & (x3 = x4) & n_cellphone(x3) & n_talk(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(on(e1,x2) & n_phone(x2) & Actor(e1,x1) & v_talk(e1) & n_man(x1))