A person drags two children through snow on a sled.
A person is swimming with two kids.
Children cannot be swimming and on a sled at the same time.
exists e1 x1 x2 x3 x4.(through(e1,x3) & on(x3,x4) & n_sled(x4) & n_snow(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drag(e1) & n_child(x2) & card_eq_2(x2) & n_person(x1))
exists e1 x1 x2.(with(e1,x2) & n_kid(x2) & card_eq_2(x2) & Actor(e1,x1) & v_swim(e1) & n_person(x1))