A guy is singing into a microphone.
A rapper and a back-up singing entertains the crowd with good songs.
Not everyone singing is a rapper. Not all singers have back-up singing, not all songs are good.
exists e1 x1 x2.(into(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_guy(x1))
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_crowd(x4) & Theme(e1,x4) & Actor(e1,x1) & v_entertain(e1) & with(x4,x5) & n_song(x5) & a_good(s2) & Theme(s2,x5) & subset_of(x3,x1) & n_singing(x3) & a_back-up(s1) & Theme(s1,x3) & subset_of(x2,x1) & n_rapper(x2))