A man plays a guitar while he sits on the grass.
The man is playing the drums on stage indoors.
A man can't be playing guitar and drums together.
exists e1 p1 x1 x2 x3.(n_grass(x3) & exists e2.(on(e2,x3) & Actor(e2,x1) & v_sit(e2)) & n_male(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_drum(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & on(x2,x3) & n_indoor(x3) & of(x3,x4) & n_stage(x4))