a group of people are enjoying their time on a carnival ride.
Nobody is enjoying.
Nobody enjoying is not the same as enjoying a specific place, a carnival ride.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_enjoy(e1) & on(x3,x4) & n_ride(x4) & a_carnival(s1) & Theme(s1,x4) & n_time(x3) & of(x3,x1) & n_thing(x1) & of(x1,x2) & n_people(x2) & n_group(x1))
-exists e1 x1.(Actor(e1,x1) & v_enjoy(e1) & n_person(x1))