A Marching Band practicing at night.
The march band is rehearsing.
Practicing is a synonym of rehearsing.
exists e1 x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_night(x3) & n_practicing(x1) & of(x1,x2) & n_band(x2) & Actor(e1,x1) & v_march(e1))
exists e1 x1 x2.(n_band(x1) & of(x1,x2) & n_march(x2) & Actor(e1,x1) & v_rehearse(e1))