G4819–συμβαίνω–sumbainō

They were on the way, going up to Jerusalem; and Jesus was going in front of them, and they were amazed; and those who followed were afraid. He again took the twelve, and began to tell them the things that were going to happen to him.

συμβαίνειν sumbainein “to happen”

They talked with each other about all of these things which had happened.

συμβεβηκότων sumbebēkotōn “having taken place”

They recognized him, that it was he who used to sit begging for gifts for the needy at the Beautiful Gate of the temple. They were filled with wonder and amazement at what had happened to him.

συμβεβηκότι sumbebēkoti “having happened”

serving the Lord with all humility, with many tears, and with trials which happened to me by the plots of the Jews;

συμβάντων sumbantōn “were happening”

When he came to the stairs, it happened that he was carried by the soldiers because of the violence of the crowd;

συνέβη sunebē “it happened that”

Now all these things happened to them by way of example, and they were written for our admonition, on whom the ends of the ages have come.

συνέβαινεν sunebainen “it was happening”

Beloved, don't be astonished at the fiery trial which has come upon you, to test you, as though a strange thing happened to you.

συμβαίνοντος· sumbainontos “were happening;”

But it has happened to them according to the true proverb, "The dog turns to his own vomit again," and "the sow that had washed to wallowing in the mire."

συμβέβηκεν sumbebēken “Has happened”