Boy and girl running along the beach.
The boy and his dog walk along the beach.
The boy is either with his dog or a girl. They cannot run and walk at the same time.
exists s1 x1 x2 x3 x4.(n_beach(x4) & ne_nam_boy(x1) & a_topic(s1) & subset_of(x2,s1) & along(x2,x4) & n_run(x2) & of(x2,x3) & n_girl(x3) & subset_of(x1,s1))
exists s1 x1 x2 x3 x4.(n_beach(x4) & n_walk(x2) & of(x2,x3) & n_dog(x3) & of(x2,x1) & n_male(x1) & n_boy(x1) & a_topic(s1) & subset_of(x2,s1) & along(x2,x4) & subset_of(x1,s1))