"For all sad words of tongue and pen, The saddest are these, 'It might have been'.

Of all sad words of tongue or pen, the saddest are these, 'It might have been.
Of all sad words of tongue or pen, the saddest are these, 'It might have been.

Of all sad words of tongue or pen, the saddest are these, 'It might have been.
Of all sad words of tongue or pen, the saddest are these, 'It might have been.