A man with brown hair is holding a guitar.
the man is at a concert
Not all men are at a concert.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_guitar(x3) & with(x1,x2) & n_hair(x2) & a_brown(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.(at(x1,x2) & n_concert(x2)))