you
You use you to refer to the person or people that you are speaking or writing to. You can be the subject or object of a verb, or the object of a preposition.
Have you got any money?
I have nothing to give you.
I want to come with you.
If you want to make it clear that you are talking to more than one person, you can use a phrase such as you two, you all, both of you, or you guys. These phrases can be the subject or object of a verb, or the object of a preposition. You guys is informal.
As you all know, this is a challenge.
You guys have helped me so much!
I'd like to invite both of you for dinner on Saturday.
I need to talk to you two.
You guys and you two can be used as vocatives.
Hey! You guys! Come over here!
Don't stay up late, you two.
You can also be used to refer to people in general, rather than to a particular person or group. You is often used like this in this book.
➜ See one - you - we - they