3.1 (Folded to SB who completes) I have a pretty wide raising range; 22+, 65s+, A2s+, A8o+, broadways. They usually give it up pre and if not we've got position and initiative, which is a fine setup for a cbet. IMO completing when folded to is giving money away.

3.2 (Folded to SB who raises) is interesting. I haven't put much thought into it, but I'd usually flat call with 22-88 and sometimes SCs/Axs if the stacks are deep, 3bet 99+, AT+, sometimes SCs/Axs if the SB has a high (>30%) steal rate and the stacks are big. I feel like my ideas on this one are poor, honestly.

3.3 (limpers, SB either completes or raises) is pretty easy if SB completes; i raise with strong top pair type hands (AQ, AK, also AJ if there's not a tight limper in EP) and 99+, otherwise I take my free look at the flop.

If SB raises, it's often tough - if we flat call we're taking a chance on whether any of the limpers want to isolate/squeeze. This is particularly a problem if one of the limpers has <20BB. Mostly I'm reraising premiums and AK here (what would be good to add for balance?) and folding the rest. This is a lousy spot IMO, but it rarely happens.

In all cases, check the attempt to steal % - I've noticed many players, including some aparently decent regs, who have a steal % no higher than their vp$ip. Against those guys, I just pretend they're a MP/LP raiser and I'm on the button.