Man on stage playing his guitar.
Man practicing piano in his home.
The man is playing a guitar, not the piano. The man is on stage not at home.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_guitar(x4) & of(x4,x1) & n_male(x1) & (x2 = x3) & n_stage(x2) & n_man(x1))
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_home(x4) & of(x4,x1) & n_male(x1) & n_piano(x1) & of(x1,x3) & n_practicing(x3) & of(x1,x2) & n_man(x2))