אתם יכולים לתקן לי פה טעויות באנגלית?

Dear Mr.Harbret,
I wanted to thank you about the sightseeing that you did for me, if you wasn't did this sightseeing I probably would kill you.
I sent Dave to this high school because I wanted Dave to success in his life, against my family.
when I saw that you punished my son only because he have no money I wanted him to leave the high school and only help me at home, and because of this I went to school to see why you punished him and what is he studying there.
From this dialogue with you and from the sightseeing that you did for me I learned that my knowledge about the world is small and the high school studies are important to know more about the world and improve him.
Yours, Luster