you are right. althoug I did have a friend (American) do that.

his English might not be as good as you. In addition, based on your situation, you should write your own not copy others. I just got idea from here how to organize the letter, I mean what should be written, what should not in letter.

其實，我並不認為這樣的信會對case的處理有什莫重大影響，隻是在無別的選擇時的一種無奈的舉措，也是為以後起訴移民局積累證據。