'Happen' in the Bible

They were on the way, going up to Jerusalem. Jesus was going ahead of them, and they were amazed, but those who followed were afraid. He took the twelve aside again and began to tell them what was going to happen to him.

I tell you the truth, if someone says to this mountain, 'Be lifted up and thrown into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him.

"Tell us, when will these things happen? And what will be the sign that all these things are about to take place?"

When you hear of wars and rumors of wars, do not be alarmed. These things must happen, but the end is still to come.

For in those days there will be suffering unlike anything that has happened from the beginning of the creation that God created until now, or ever will happen.