A youngster plays with a toy.
youths plays with toys
Youth is a youngster.
exists e1 x1 x2.(with(e1,x2) & n_toy(x2) & Actor(e1,x1) & v_play(e1) & n_youngster(x1))
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_toy(x3) & n_play(x1) & of(x1,x2) & n_youth(x2))