A band practicing for a gig.
The band broke up before the practice started
A band will not have been practicing if they had broke up before the practice started.
exists x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_gig(x3) & n_practicing(x1) & of(x1,x2) & n_band(x2))
exists e1 p1 s1 x1 x2.(n_practice(x2) & n_band(x1) & exists e2.(Actor(e2,x2) & v_start(e2)) & before(e1,p1) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_break(e1))