I am trying to understand why these Greek words ὅδε, οὗτος, and ἐκεῖνος regularly take the predicate position. I found this inductive knowledge from doing a Greek word study of the three words. I also tried searching in Logos with an all search but I did not come up with much background on this matter. Can someone guide me to a section in any of the Greek grammars that decode the basis for understanding this topic and possibly rule in Koine Greek studies? I read the following but could not find any useful sections.
Robertson, A. T.. A Grammar of the Greek New Testament in the Light of Historical Research. United Kingdom: Hodder & Stoughton, 1914.
Dobson, John H. Learn New Testament Greek. Grand Rapids: Baker Publishing Group, 2005.
Vine, W. E. Learn New Testament Greek. Nashville: Thomas Nelson, 1997.
Strauss, Mark L.. The Biblical Greek Companion for Bible Software Users: Grammatical Terms Explained for Exegesis. Grand Rapids: Zondervan, 2016.
Mounce, William D.. Basics of Biblical Greek Grammar. Grand Rapids: Zondervan, 2009.
Croy, N. Clayton. A Primer of Biblical Greek Grand Rapids: Eerdmans, 2007.