Knowing When to Use "Me" or "I" in a Sentence

I used to be confused when to use "Me" or "I" in a sentence.  But there's actually a simple test to know which is more adequate to use.  All you have to do is to replace:

• You and "I" = We
• You and "Me" = Us

So let's try some examples:

1. You and I are going to be rich!  (We are going to be rich!) 
2. It's you and me against the world. (It's us against the world)

Simple right?  Keep this grammar rule in mind and you'll avoid this common grammatical error.