A man sings on stage with a guitar.
A man is singing on stage with a guitar indoors
Sentence 1 is missing man is indoors
exists e1 x1 x2 x3.(on(e1,x2) & with(x2,x3) & n_guitar(x3) & n_stage(x2) & Actor(e1,x1) & v_sing(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(on(e1,x2) & with(x2,x3) & n_indoor(x3) & of(x3,x4) & n_guitar(x4) & n_stage(x2) & Actor(e1,x1) & v_sing(e1) & n_man(x1))