There is no difference between you (singular) and you (plural) when it comes to tenses:
- You are a good friend.
- You are very good friends.(plural)
- You were a fit guy 2 years ago.
- You were very fit 2 years ago.(plural)
- You will call me tomorrow.(singular or plural depending on the context)
So, you use them in the same way, but the only way to understand if it’s plural or singular is context.
I hope this helps 🙂
List of Words Without Plural Form (Uncountable Nouns)
Is there plural for “Staff”?