The two children are being sprayed by water
Two kids sprayed with water.
If you are being sprayed by something you are being sprayed with it.
exists e1 x1 x2.(n_child(x1) & card_eq_2(x1) & Actor(e1,x2) & n_water(x2) & Theme(e1,x1) & v_spray(e1))
exists e1 x1 x2.(with(e1,x2) & n_water(x2) & Actor(e1,x1) & v_spray(e1) & n_kid(x1) & card_eq_2(x1))