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'Sein' and 'Werden' always take the nominative case, more on that here: http://www.jabbalab.com/blog/795/how-the-german-cases-work-nominative-accusative-dative-and-genitive
du = you (singular, informal)
ihr = you (plural, formal)
Sie = you (singular or plural, formal)
informal = friends, family, people you know well, children
formal = people you don't know, elders, employers, instructors
They all conjugate differently. See the table at the intro to Basics 1:
Maybe you can give this a read: http://yourdailygerman.wordpress.com/2011/12/31/learn-german-online-meat-the-team-i-you-she-and-so-on/
It introduces personal pronouns and genders in German. You can't explain one thing without the other, especially when it comes to he/she/it.