The first thing that comes to mind is to put a supporting joist in underneath. I'd try to determine where the next floor joist is and cut a 2 by 4 to fit that length. Then I'd slap some construction adhesive onto the ends that butt against the joists, clamp it in place, and if you can nail the other floor boards to the new joist, I'd do that. If you can't get a clamp to seat against the current floor easily, you can cut another board to span the gap in the floor, screw throught that into the new joist and tightening the screws will pull the new joist up against the floor.
As far as putting new tongue and groove in, jwoody has the right idea. Cut the tongue off the piece you're trying to install.
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