An artist creating a pottery while wearing an apron.
An artist is sleeping.
The artist can'tbe creating pottery and be asleep at the same time.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_wear(e2) & n_apron(x4) & Theme(e1,x3) & Actor(e1,x2) & v_create(e1) & n_pottery(x3) & (x1 = x2) & n_artist(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_artist(x1))