A young boy is sitting on the grass.
A young boy is inside
One cannot be sitting on the grass while he is inside.
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 s2 s3 x1.(a_inside(s3) & Manner(s2,s3) & Theme(s2,x1) & a_event(s2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))