An adult and a child walk along the beach during the day.
An adult and kid are on the beach.
A kid and a child are not necessarily the same thing, depending on your classification. If you are walking along the beach, you may not be on the beach.
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 p1 x1 x2 x3 x4.(n_beach(x4) & on(x1,x4) & n_kid(x3) & n_adult(x2) & subset_of(x3,x1) & subset_of(x2,x1))