Can someone please explain when to use which variant of you.
I hope this covers it pretty well :)
Du---Subject of the sentence (Vad heter du?)
Dig---object (Jag älskar dig)
Din---possessive (common) Din katt
Ditt---possessive (neuter) Ditt hus
Dina---possessive (plural) Dina barn
Also, there is "ni" which is apparently a formal version of you? (I read that it is something that you would call the king?) I'm a little unclear on that one..
Maybe the plural/somewhat-archaic-polite version as well?
Ni -- Subject of the sentence - Vad heter ni/Ni? (capital usually used for polite version)
Er -- object - Jag älskar er/Er (polite version extremely uncommon today, I would say)
Er -- possessive (common) - er/Er katt
Ert -- possessive (neuter) - Ert hus (quite frankly, I don't know if you would use Ert [capital] in this case, since I don't think I've ever seen it, but it feels kind of right)
Era -- possessive (plural) - Era barn
They are always used the plural you in Swedish (there is no other word, at least to my knowledge), and sometimes in formal language, similar to French vous or Spanish usted/ustedes ^^
You don't really have to worry about the polite version (although I would actually be surprised if you didn't recognize it XD), but the plural is quite important!
Edit: They have been ignored? Really? That's... pretty odd, actually o.O