If you are addressing a group of people, the pronoun you should use is..

The formal version of the pronoun 'you' in German is...

English used to have a formal and informal version of you

When speaking to your brother, you should use the pronoun...

If you were speaking to your boss at work, you should use the pronoun

If you were in Germany speaking to your teacher, you should use the pronoun

If you were in Germany, your teacher would use this pronoun when speaking to you

When speaking to your friend's father, you should use...

You're in Germany and your wallet has been stolen. With a police officer, you should use...

In Berlin, a group of obnoxious tourists asks if you'll take their picture; you should use...

When speaking to a person that has introduced herself by her last name, you should use..

When speaking to a person that has introduced themselves by their first name, you should use...

When speaking to your mother, you should use...

You approach a few of your friends and ask them what they're doing this weekend, you use the pronoun...

Do you understand the difference between du, ihr and Sie now?