A man plays his guitar while sitting.
man giving concert
Playing a guitar does not imply giving a concert.
exists e1 e2 x1 x2.(while(e1,e2) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & of(x2,x1) & n_male(x1) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_give(e1) & n_concert(x3) & (x1 = x2) & n_man(x1))