A boy in a large pool.
A human in a pool
A boy is a human.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_pool(x2) & a_large(s1) & Theme(s1,x2) & n_boy(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_pool(x2) & n_human(x1))