The children played on the four wheeler in the field.
The children are riding west on the four wheeler.
It is not known if the children are riding west.
exists e1 x1 x2 x3.(n_field(x3) & n_wheeler(x2) & card_eq_4(x2) & n_child(x1) & on(e1,x2) & in(x2,x3) & Actor(e1,x1) & v_play(e1))
exists e1 x1 x2 x3.(n_wheeler(x3) & card_eq_4(x3) & n_child(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_west(x2))