A group of people are riding bikes across a bridge.
The group of people on bicycles were fell off the bridge
A group of people either cross a bridge of fell off the bridge.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & across(x3,x4) & n_bridge(x4) & n_bike(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_bridge(x5) & n_group(x1) & a_off(s1) & Manner(e2,s1) & Theme(e2,x5) & Actor(e2,x1) & v_fall(e2) & Actor(e1,x4) & v_be(e1) & (x1 = x4) & on(x1,x3) & n_bicycle(x3) & of(x1,x2) & n_people(x2))