A crowd watching air balloons at night.
Air balloons fly before a crowd at night.
If a crowd is watching the air balloons at night it is implied that the air balloons are flying before the crowd.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & at(e1,x5) & n_night(x5) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & n_balloon(x3) & of(x3,x4) & n_air(x4) & (x1 = x2) & n_crowd(x1))
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_night(x4) & before(e1,x3) & n_crowd(x3) & Actor(e1,x1) & v_fly(e1) & n_balloon(x1) & (x1 = x2) & ne_nam_air(x2))