a man and a dog walking on the beach together.
A stray dog starts following a man on the beach.
Not every dog is a stray.
exists s1 x1 x2 x3 x4.(n_beach(x4) & a_topic(s1) & subset_of(x2,s1) & on(x2,x4) & r_together(x4) & n_walking(x2) & of(x2,x3) & n_dog(x3) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 x1 x2 x3.(n_beach(x3) & follow(e1,x2) & on(x2,x3) & n_man(x2) & Actor(e1,x1) & v_start(e1) & n_dog(x1) & a_stray(s1) & Theme(s1,x1))