A man is riding a four wheeler through some dirt.
A person is on a four wheeler.
Is a man is riding a four wheeler, he is on the four wheeler.
exists e1 x1 x2 x3.(through(e1,x3) & n_dirt(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wheeler(x2) & card_eq_4(x2) & n_man(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_wheeler(x2) & card_eq_4(x2)) & n_person(x1))