A young boy is sitting on the grass.
A child is outside.
A young boy is a child and sitting on the grass implies being outside.
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_child(x1))