A man is playing the guitar while another man plays the drums in front of a crowd of people.
the man has a guitar.
A man can only be playing the guitar if he has a guitar.
exists e1 p1 x1 x2 x4.(n_drum(x4) & n_guitar(x2) & exists e2 x3 x5 x6 x7.(in(e2,x5) & of(x5,x6) & of(x6,x7) & n_people(x7) & n_crowd(x6) & n_front(x5) & Theme(e2,x4) & Actor(e2,x3) & v_play(e2) & n_man(x3) & -(x3 = x1)) & n_man(x1) & n_man(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_guitar(x2))