The children played on the four wheeler in the field.
There is a lot of dirt.
children playing on the four wheeler in the field does not indicate that there is a lot of dirt.
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 p1 x1 x2 x3.((x1 = x2) & of(x2,x3) & n_dirt(x3) & n_lot(x2))