'Happen' in the Bible

After all this I looked and saw a door in Heaven standing open, and the voice that I had previously heard, which resembled the blast of a trumpet, again spoke to me and said, "Come up here, and I will show you things which are to happen in the future."

And he said to me, "These words are trustworthy and true; and the Lord, the God of the spirits of the Prophets, sent His angel to make known to His servants the things which must soon happen.