A girl toddler is sitting on the grass.
A child is having a picnic.
children don't always have a picnic when sitting on the grass
exists e1 x1 x2 x3.(n_grass(x3) & on(e1,x3) & Actor(e1,x1) & v_sit(e1) & n_toddler(x1) & of(x1,x2) & n_girl(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_picnic(x2) & n_child(x1))