How to write personal letter?

Private Letter

A. a Letter To The Teacher

20 Jl. Karya
Ngabang, Landak Regency
March 15, 2009.

Dear sir,
I’m sorry that I can’t follow my classes today
because I got a bit dizzy.

Therefore, I have to stay at home. I hope getting better soon.
I will follow my classes tomorrow


Yours faithfully,


Aditya Dewana


B.Invitation

Ngabang, Landak Regency
March 16, 2009

Dear friends,
I’m going to celebrate my 12th birthday, on March 18, 2009.
The party is held at my house at 10 Jl. Karya. At 9 pm. Please,
Come.

Thank you for your response.

Yours,

Shinta