These chapters are on Jesus’s discourse about the destruction of Jerusalem and the temple (AD 70) and then the Second Coming, which has not happened yet 2000 years later (and counting). Looking at the chapters side by side clarifies what he really taught. I updated this post.
They are now much clearer to me (at least).
This post has now been updated here:
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Matt. 24:36 to 25:46–From Second Coming to New Messianic Age
Mark 13:5-31 Predicts Destruction of Jerusalem and Temple
Mark 13:32-37 Teaches Second Coming
Luke 21:5-33 Predicts Destruction of Jerusalem and Temple (Luke is by far the clearest on this topic)
Luke 17:22-37 and 21:34-36 Teach the Second Coming
Cosmic Disasters = Apocalyptic Imagery for Judgment and Major Change
Three Options for Interpreting Matthew 24, Mark 13, Luke 21 (I discuss two other interpretations)
Luke 17:22-37: Taken Away = Rapture? (I also briefly look at Matthew’s version)
Dr. Jim's Essential Bible Teaching 
Your unit 4. Matthew 24:9 says “Then they will deliver you up” and was to the four apostles on. The Mt. Of Olives. Luke 21 states “But before all this” and was given to the believers in the temple. Both passages are relative to the beginning of sorrows. Luke referencing the fall of Jerusalem in 70 ad and Matthew at the Great Tribulation?
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I think Jesus was speaking way beyond the four disciples. All the things (except Unit 12) had to happen before Jesus’s generation expired. And they did. I don’t like to slice up passages (e.g. before the Great Tribulation and after) when they provide a flow, unless Matthew uses the key terms in Unit 12 to indicate a shift in subject. Shocker: I have not made up my mind on whether there even is a seven-year Great Tribulation, based on my study, so far, of the noun thlipsis and the Revelation. Plus, whatever the Rev. means, I believe it is bad hermeneutics to permit the most symbolic book of the Bible (Rev.) to clarify and even control the narratives (four Gospels and Acts) and the epistles. But I do believe that things will get worse. In any case, thanks for your thoughts, but I won’t be able to carry on a convo with you.
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Jim
I think you did a great job comparing and explaining these passages. Thank you for your work. This article was very helpful to me.
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