Several people are riding motorcycles down a narrow street.
People driving car down narrow street
People aren't riding motorcycles AND driving cars down the narrow street.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & down(x2,x3) & n_street(x3) & a_narrow(s2) & Theme(s2,x3) & n_motorcycle(x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & down(e1,x4) & n_street(x4) & a_narrow(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & n_car(x3) & (x1 = x2) & n_people(x1))