A man dressed in black walks down the street.
A man dressed in black catches a bus.
The man is either walking or taking the bus not both.
exists e2 e1 s1 x1 x2 x3 x4.(n_street(x4) & down(e2,x4) & Actor(e2,x1) & v_walk(e2) & Theme(e1,s1) & Theme(s1,x3) & a_black(s1) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(a_topic(x1) & all x3.(n_bus(x3) -> exists s1 x4.(in(e1,x4) & for(x4,x3) & n_catch(x4) & a_black(s1) & Theme(s1,x4))) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))