A group of people are sitting on a rocky beach.
A group of people are getting together for a beach party.
We have no idea if they are getting together for a beach party, they could be doing a number of things.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_beach(x3) & a_rocky(s1) & Theme(s1,x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 p1 x1 x2 x3 x4.(for(e1,x3) & n_party(x3) & of(x3,x4) & n_beach(x4) & exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & of(x1,x2) & n_people(x2) & n_group(x1))