A woman plays bass and sings with her bandmate with is a man playing guitar and the drummer plays in the background.
The woman is banging on a drum
Either the woman is playing bass or banging on a drum. She cannot do both at the same time.
(x)
exists e1 x1 x2.(n_woman(x1) & on(e1,x2) & n_drum(x2) & Actor(e1,x1) & v_bang(e1))