A man plays a guitar on a stage, the lights bright behind him.
He is nervous.
A man playing guitar onstage need not be nervous.
exists e1 s1 x1 x2 x3 x4 x5.(n_light(x4) & on(e1,x3) & rel(x3,x4) & behind(x4,x1) & n_male(x1) & Theme(s1,x5) & a_bright(s1) & (x4 = x5) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1))
exists s1 x1.(n_male(x1) & Theme(s1,x1) & a_nervous(s1))