A group of bicyclists racing.
They race all the time.
A group of bicyclists may be racing for the first time and it can't be assumed that they race all the time.
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_race(e1) & (x1 = x3) & of(x1,x2) & n_bicyclist(x2) & n_group(x1))
exists s1 x1 x2.(a_topic(x1) & n_all(x1) & n_time(x2) & (x1 = x2) & n_race(x1) & a_they(s1) & Theme(s1,x1))