A man alone on a gravely beach.
The man is on a crowded, sandy beach.
The man in sentence one is on a gravely beach. The man in sentence two is on a sandy beach. It is possible to be in a crowded area but still be alone.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_beach(x2) & a_gravely(s1) & Theme(s1,x2) & r_alone(x1) & n_man(x1))
exists p1 x1.(n_man(x1) & exists s1 s2 s3 x2.(on(x1,x2) & n_beach(x2) & a_sandy(s3) & Theme(s3,x2) & a_,(s2) & Theme(s2,x2) & a_crowded(s1) & Theme(s1,x2)))