Children having a pillow fight.
The girls sit with their pillows.
If the children are having a pillow fight, they would not be sitting with their pillows.
exists e1 x1 x2 x3.(ne_nam_children(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fight(x2) & of(x2,x3) & n_pillow(x3))
exists e1 x1 x2.(n_pillow(x2) & of(x2,x1) & n_thing(x1) & n_girl(x1) & with(e1,x2) & Actor(e1,x1) & v_sit(e1))