'Happen' in the Bible

The LORD told him, "This won't happen, because whoever kills you will suffer seven times the vengeance." Then the LORD placed a sign on Cain so that no one finding him would kill him.

"Do you happen to know Nahor's son Laban?" he inquired. "We do," they replied.

After all, how can I go back to my father if the young man doesn't accompany me? I'm afraid of what might happen to my father."

After this, Jacob called his sons together and told them, "Assemble yourselves around me so I can tell you all what is going to happen to you in the last days.