A person is riding an orange ATV in a large empty field.
A person is chasing after the other person on the ATV.
A person riding an ATV does not imply chasing.
exists e1 s1 s2 x1 x2 x3 x4.(in(e1,x4) & n_field(x4) & a_empty(s2) & Theme(s2,x4) & a_large(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_atv(x2) & of(x2,x3) & n_orange(x3) & n_person(x1))
exists e1 x1 x2 x3.(ne_org_atv(x3) & -(x2 = x1) & n_person(x2) & after(e1,x2) & on(x2,x3) & n_person(x1) & n_person(x1) & Actor(e1,x1) & v_chase(e1))