A man is singing with a microphone on the sidewalk
The man is singing oprah tunes.
The man is singing but is not necessarily singing oprah tunes.
exists e1 x1 x2 x3.(n_sidewalk(x3) & with(e1,x2) & on(x2,x3) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sing(e1) & n_tune(x2) & a_oprah(s1) & Theme(s1,x2))