A man wearing a black jacket is playing guitar.
A man in a band is on stage playing a guitar
A man wearing a black jacket is playing guitar does not imply that he is in a band is on stage playing a guitar
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & n_guitar(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_jacket(x3) & a_black(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists p1 x1 x2.(exists e1 x3 x4 x5.(on(x1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & n_guitar(x5) & (x3 = x4) & n_stage(x3)) & in(x1,x2) & n_band(x2) & n_man(x1))