Translation of desert in Spanish

I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
Why do you wanna learn to speak Portuguese, it's a very difficult language? I don't know many people who can speak well, except Portuguese and Brazilians of course. I love the sound of it.
Sorry that I did not write earlier. I have got a lot of work in my office. I did not forget and always think about writing you. What exactly do you study? Do you have children? Are you married?