This group of boys are fishing off of a bridge.
Boys are fishing.
A group of boys were fishing off the bridge
exists e1 x1 x2 x3.(n_group(x1) & of(e1,x3) & n_bridge(x3) & r_off(e1) & Actor(e1,x1) & v_fish(e1) & of(x1,x2) & n_boy(x2))
exists p1 x1.(exists x2.((x1 = x2) & n_fishing(x2)) & n_boy(x1))