quick question

[ManInBlue]

I have, for some reason, gotten confused about a situation. I need some help.

1. If a runner is in contact with a base (one which he has legally acquired and has not been forced to vacate) and he is hit with a fair batted ball - what's the call?

2. If R1 is hit with a fair batted ball while in contact with 1B - what's the call?

3. If in sitch #2, F3 is behind him and could have made a play on the ball - what's the call?

Just for arguements sake let's assume it's a line drive, not an IFF.

I realize that there aren't many reasons for a runner to be in contact with a base when the ball is hit, but...

FED and OBR, please, if they differ.