A group of girls are riding on a roller coaster.
People scream on the ride.
Just because a group of girls is riding on a roller coaster does not mean they are going to scream.
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_coaster(x3) & of(x3,x4) & n_roller(x4) & Actor(e1,x1) & v_ride(e1) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 x1 x2.(n_ride(x2) & on(e1,x2) & Actor(e1,x1) & v_scream(e1) & n_people(x1))