Several people are riding motorcycles down a narrow street.
The people who are shown are in a motorcycle club.
Riding motorcycles down a narrow street don't mean that they are in a motorcycle club.
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 p1 x1 x2.(n_people(x1) & exists x3 x4.(in(x1,x3) & n_club(x3) & of(x3,x4) & n_motorcycle(x4)) & Theme(e1,x2) & v_show(e1) & (x1 = x2))