since (used after a specified time or event)

There is nothing new transpired since I wrote you last.

And I know you didn't do this just to win an election. And I know you didn't do it for me. You did it because you understand the enormity of the task that lies ahead. For even as we celebrate tonight, we know the challenges that tomorrow will bring are the greatest of our lifetime: two wars, a planet in peril, the worst financial crisis in a century.

Ever since his father died, David has been very sad.

The business hasn't been paying for the last six months.

You can come to my party, but you have to bring me a gift.