A man and a woman are singing into microphones.
The man and woman are lipsynching into a microphone.
A man and woman aren't singing into a microphone if they are technically lipsynching.
exists e1 x1 x2 x3 x4.(into(e1,x4) & n_microphone(x4) & Actor(e1,x1) & v_sing(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 x1 x2 x3 x4.(n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & into(e1,x4) & n_microphone(x4) & Actor(e1,x1) & v_lipsynch(e1))