A mailman delivering the days mail.
A man is delivering the mail.
man delivering mail is a rephrasing of mailman delivering
exists e1 x1 x2 x3 x4.(n_day(x4) & a_topic(x1) & Recipient(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_deliver(e1) & n_mail(x3) & (x1 = x2) & n_mailman(x1))
exists e1 x1 x2.(n_mail(x2) & Theme(e1,x2) & Actor(e1,x1) & v_deliver(e1) & n_man(x1))