G4819–συμβαίνω–sumbainō

They were still on the road going up to Jerusalem, and Jesus was walking ahead of them; they were full of wonder, and some, though they followed, did so with fear. Then, once more calling to Him the Twelve, He began to tell them what was about to happen

συμβαίνειν sumbainein “to happen”

and were conversing about all these recent events;

συμβεβηκότων sumbebēkotōn “having taken place”

and recognizing him as the man who used to sit at the Beautiful Gate of the Temple asking for alms, they were filled with awe and amazement at what had happened to him.

συμβεβηκότι sumbebēkoti “having happened”

serving the Lord in all humility, and with tears, and amid trials which came upon me through the plotting of the Jews--

συμβάντων sumbantōn “were happening”

When Paul was going up the steps, he had to be carried by the soldiers because of the violence of the mob;

συνέβη sunebē “it happened that”

All this kept happening to them with a figurative meaning; but it was put on record by way of admonition to us upon whom the ends of the Ages have come.

συνέβαινεν sunebainen “it was happening”

Dear friends, do not be surprised at finding that that scorching flame of persecution is raging among you to put you to the test--as though some surprising thing were accidentally happening to you.

συμβαίνοντος· sumbainontos “were happening;”

Their case is that described in the true proverb, "A dog returns to what he has vomited," and also in the other proverb, "The sow has washed itself and now goes back to roll in its filth."

συμβέβηκεν sumbebēken “Has happened”