A singer standing in green light.
A guitar player sits on a stool and plays.
A singer is not the same as a guitar player typically. In addition, one cannot be standing and sitting at the same time.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_light(x3) & a_green(s1) & Theme(s1,x3) & n_standing(x1) & of(x1,x2) & n_singer(x2))
exists e1 x1 x2 x3 x4 x5.(on(e1,x3) & subset_of(x5,x3) & n_play(x5) & subset_of(x4,x3) & n_stool(x4) & Actor(e1,x1) & v_sit(e1) & n_player(x1) & of(x1,x2) & n_guitar(x2))