A young boy playing in the water.
A younster is playing.
A young boy is a youngster.
exists s1 x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_younster(x1))