Jesus has just answered questions concern matters of the future.  Some of the events he mentions in those verses (Luke 21:20-28) have been fulfilled, some have not yet occurred .  The verses I share  hear today have not yet come to pass, but they will, and I can say that because of verse 33.

And He spake to them a parable;
“Behold the fig tree, and all the trees; when they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.  So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand.  Verily I say unto you, This generation shall not pass away, till all be fulfilled.  Heaven and earth shall pass away: but my words shall not pass away.
Luke 21:29-33

You can read more on these verses at “The Fire and Hammer