Children play fight with swords.
Children are pretending to be pirates and playing with swords.
For children to play fight sword doesn't mean they are playing pretending to be pirates as they play with their swords they could be playing anything else.
exists e1 x1 x2 x3.(with(e1,x3) & n_sword(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_fight(x2) & n_child(x1))
exists e1 e2 p1 x1 x2 x3.(with(e2,x3) & n_sword(x3) & Actor(e2,x2) & v_play(e2) & n_child(x2) & Topic(e1,p1) & Actor(e1,x1) & v_pretend(e1) & exists p2 x4.((x1 = x4) & n_pirate(x4)) & n_child(x1))