An adult and a child walk along the beach during the day.
Some people collecting seashells along the beach.
If you're walking along the beach you aren't necessarily collecting seashells
exists s1 x1 x2 x3 x4 x5.(n_day(x5) & n_beach(x4) & a_topic(s1) & subset_of(x2,s1) & during(x2,x5) & along(x2,x4) & n_walk(x2) & of(x2,x3) & n_child(x3) & subset_of(x1,s1) & n_adult(x1))
exists e1 x1 x2 x3 x4.(n_beach(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_collect(e1) & along(x3,x4) & n_seashell(x3) & (x1 = x2) & n_people(x1))