A couple enjoys themselves in front of a red curtain.
Couple performs on stage.
A red curtain in the background can have nothing to do with a person performs on stage.
exists e1 s1 x1 x2 x3 x4.(n_group(x2) & in(e1,x3) & of(x3,x4) & n_curtain(x4) & a_red(s1) & Theme(s1,x4) & n_front(x3) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_couple(x1))
exists e1 x1 x2.(on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_perform(e1) & n_couple(x1))