How to: Making Introductions

Here are some phrases you can learn to make introductions. We've split them into three categories: 


formal
May I introduce you to ... (The President of the USA)


informal
Hello. I don't think we've met before. I'm ... 
I don't think you two know each other, do you?
Hi! You must be ... 

neutral

I'd like to introduce you to ... (Cameron Diaz)

Can I introduce myself? I'm / My name is ... (Silvio B)

Can I introduce ... (a friend of mine)? This is ... (Ben STiller)

I don't know if you remember me. We met ... (at the Oscars last year).

Excuse me, would you by any chance be ... (Princess Lea)?