A man and a woman on a path.
A sad man and a woman on a path.
A man is not always sad.
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists s1 s2 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1) & a_sad(s2) & Theme(s2,x1))