The man does a trick on the fourwheeler.
A guy on an ATV.
A man can do tricks on an ATV which is also a fourwheeler.
exists e1 x1 x2 x3.(n_fourwheeler(x3) & n_man(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2))
exists x1 x2.(a_topic(x1) & on(x1,x2) & ne_org_atv(x2) & n_guy(x1))