A man in a red shirt and black vest is playing the guitar.
a man is practicing
Playing the guitar does not mean he is practicing it.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_guitar(x5) & Theme(e1,x5) & Actor(e1,x1) & v_play(e1) & in(x1,x2) & n_vest(x4) & a_black(s2) & Theme(s2,x4) & n_shirt(x3) & subset_of(x4,x2) & subset_of(x3,x2) & a_red(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_practice(e1) & n_man(x1))