so long as; provided; if

You have only to touch the button.

This is our chance to answer that call. This is our moment. This is our time, to put our people back to work and open doors of opportunity for our kids; to restore prosperity and promote the cause of peace; to reclaim the American dream and reaffirm that fundamental truth, that out of many, we are one; that while we breathe, we hope. And where we are met with cynicism and doubt and those who tell us that we can't, we will respond with that timeless creed that sums up the spirit of a people: Yes, we can.

I will never forget your kindness so long as I live.

If you are by my side, I don't need anything else.

I will lend you any book that I have, so long as you keep it clean.