Kids playing in the ocean.
A child is building a sandcastle.
If you are in the ocean you can not be building a sandcastle because the sand is dry
exists e1 x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_sandcastle(x2) & n_child(x1))