A man sitting on public transportation.
A man is sitting down.
A man is seated on public transportation, so he must be sitting down.
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_transportation(x3) & a_public(s1) & Theme(s1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))