[calidris]

Hand 1:
SB can just be pretty tired of playing his diminishing stack here and donkraising everything. I think I raise this flop to try and get it HU.

On the turn you pick up the nut OESD which gives you around 6 outs w the 2 remaining Q (meybe discount total to 5). Pot is big enough to call down.

Hand 2:
I think I c/f this turn. Looks like a Q with a K, J or A when he avoids capping. When the 2nd Q comes on the turn I feel it's time to admit defeat.

Hand 3:
I play it the same. He must know now that you beat TPTK but doesn't care. Looks like a set, or maybe, just maybe, AK.

Hand 4:
Huh? Just confusing with 3way cap PF and checked to you on this flop. I think I play it the same. No way i'm releasing my hand on this non scary board. Sure you might be up against AA or KK but not often enough to make folding an option

Hand 5:
As a variation you might think about checking this PF but I probably raise it up also since noone is showing any strength. Turn c/r smells AT, I do not raise that river. I probably call though.

On second thinking it's probably best to b/f turn here.