Boy and girl running along the beach.
The kids are playing on the beach.
The kids, a boy and a girl, are running and then playing on the beach.
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 e1 x1 x2.(n_beach(x2) & n_kid(x1) & on(e1,x2) & Actor(e1,x1) & v_play(e1))