A person rides an ATV through the desert.
The person is waiting to buy an ATV.
The person can't be riding an atv and waiting to buy an atv at the same time.
exists e1 x1 x2 x3.(n_desert(x3) & through(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & ne_org_atv(x2) & n_person(x1))
exists e1 p1 x1.(n_person(x1) & Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_buy(e2) & ne_nam_atv(x2)))