Possessives in Chinese

I started it over with my Chinese studies. Today I learned something about possessives. We have to use the word "de" to refer to the possessives. Let's see some examples:

I - Wo3.
My - Wo3 de.
My house - Wo3 de jia1.
My friend - Wo3 de peng2 you3.
My good friend - Wo3 de hao3 peng2 you3.
My very good friend - Wo3 hen3 hao3 de peng2 you3.
My friend's house- Wo3 peng2 you3 de jia1.

This is very basic but it's very useful. If you are studying chinese by yourself this is great.