You form in german ( ihr/du = informell/2nd Person)(Sie =formell(singular,plural both/2nd person)) (sie =3rd person)

Different ways of saying you

                        singular                        plural

Ist person           I                                  we  

2nd person        you                           you  ( same for singualar and plural)

3rd person       he/she/it                  They  

Fred ,what are you doing?

Fred and Anna ,what are you doing?

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in german ,there are different pronouns for 2nd person singualar and plural .(informell)

one person = du   ,plural = Ihr

Ist person     ich                          wir

2nd person    du                        Ihr  (informell)

3rd person     er/es/sie               sie

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informell

Peter ,was machst du?

Peter und gabi ,was macht Ihr?

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du = informal =  one person

Ihr =informell = more than one person

Sie =formell  talking to a adult (or multiple adults)

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Herr Müller und Frau Schmidt,was machen Sie?

Wir machen Tee.

Frau Katja ,was machen Sie?      ( to give respect ,Frau with name used)

Ich mache Tee