Bike riders stop riding while one rider fixes bike.
Group of people watching while someone fixes their bike.
If one rider fixes his bike then you can say that someone fixes their bike
exists e1 p1 x1 x2.(exists e2 p2.(exists e3 x3 x4.(Theme(e3,x4) & Actor(e3,x3) & v_fix(e3) & n_bike(x4) & n_rider(x3) & card_eq_1(x3)) & while(e2,p2) & Actor(e2,x1) & v_ride(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_stop(e1) & n_rider(x1) & (x1 = x2) & ne_nam_bike(x2))
exists e1 p1 s1 x1 x2 x4.(ne_org_group(s1) & a_topic(s1) & of(s1,x1) & exists e2 x3.(Theme(e2,x4) & Actor(e2,x3) & v_fix(e2) & n_person(x3)) & n_bike(x4) & of(x4,x1) & n_thing(x1) & while(e1,p1) & Actor(e1,x2) & v_watch(e1) & (x1 = x2) & n_people(x1))