Ihr and Du
What is the difference between Ihr and Du? How do I know which to use?
Are you talking to one person? If so, use "Du".* Are you speaking to two or more people, use "ihr".
*If you are talking with someone and he says that he and his family are going somewhere and you want to ask where they are going, you can use word "ihr" as in "Wohin geht ihr?" even though you are only speaking directly to him- or as we would say in my part of the US "Where are you guys going?" The person responding would most likely answer using the word "wir" as in "Wir fahren nach Berlin" - in English, "We are going to Berlin". So you could use "ihr" with one person, but you would be referring to a group.