A man is walking along a beach.
A sad man is walking along a beach.
Just because a man is walking along a beach does not mean he is sad.
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 s1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1) & a_sad(s1) & Theme(s1,x1))