Some people riding scooters in the street.
Dogs riding scooters in the street.
There can be either people or dogs.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_scooter(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_scooter(x3) & (x1 = x2) & n_dog(x1))