A woman in a blue dress is dancing.
the child was happy
Not all woman is a child. Being dancing does not imply happy.
exists e1 s1 x1 x2.(Actor(e1,x1) & v_dance(e1) & in(x1,x2) & n_dress(x2) & a_blue(s1) & Theme(s1,x2) & n_woman(x1))
exists s1 x1.(n_child(x1) & Theme(s1,x1) & a_happy(s1))