A small boys dumps water on a baby.
A small boy and a baby
Both a boy and a baby must exist in order for the boy to dump anything on the baby.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_baby(x3) & Theme(e1,x2) & Actor(e1,x1) & v_dump(e1) & n_water(x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
exists s1 s2 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_baby(x2) & subset_of(x1,s1) & n_boy(x1) & a_small(s2) & Theme(s2,x1))