Some children run through a fountain.
Some kids are running.
Kids are children are the same thing and to run through a fountain requires running
exists e1 x1 x2.(through(e1,x2) & n_fountain(x2) & Actor(e1,x1) & v_run(e1) & n_child(x1))
exists e1 x1.(Actor(e1,x1) & v_run(e1) & n_kid(x1))