2 more polite than 1 3 and 4 perhaps more polite than 1 and 2, because they don't inquire the will (as does "would") of the other person.
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Marius Hancu2 more polite than 1Much appreciated, Marius.
3 and 4 perhaps more polite than 1 and 2, because they don't inquire the will (as does "would") of the other person.
Nona The BritAny expression is politer if you add 'please'.
We can't really say where to use each expression as every situation varies, and it's certainly not the case that you would use one in the workplace and one at home. All these expressions can be used to either make a request, or to make an instruction/order more polite.
Thank for your reply, Nona