Avril Lavigne singing during a concert.
There is a singer at a concert.
Singer can be singing during concert
exists e1 x1 x2 x3.(ne_per_lavigne(x1) & (x1 = x2) & ne_per_avril(x2) & during(e1,x3) & n_concert(x3) & Actor(e1,x1) & v_sing(e1))
exists p1 x1 x2 x3.((x1 = x2) & at(x2,x3) & n_concert(x3) & n_singer(x2))