two children are playing soccer
Brothers play soccer with a basketball.
You can not infer it is with a basketball.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_soccer(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(ne_org_brothers(x1) & with(e1,x3) & n_basketball(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_soccer(x2))