Two women talk and laugh while people walk by.
Some women were laughing on their walk.
The two women talk and laugh while people walk by so they may not be on a walk themselves.
(-x)
exists e1 x1 x2.(on(e1,x2) & n_walk(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_laugh(e1) & n_woman(x1))