A group of people are sitting on stools eating some food
People are sitting together.
A group of people sitting would mean that the people are sitting together.
exists e1 e2 x1 x2 x3 x4 x5.(on(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_eat(e2) & n_food(x5) & (x3 = x4) & n_stool(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))