I have been actively using English language both in written and spoken form for the past ten years, communicating in English in my unverstiy studies and later in work. I have been working as a tourist guide for the last 3 years ;during that time I got to know many different variations of English - both depending on culture and circumnstances of the learning process. That gave me a better understanding of the language as a whole. Although I lack state acknowledged education, my everyday involvement in spoken English profiled me as a person to speak to. Simultaneously to my work as a guide I have been working as an English language lecturer for a number of companies, specified in education through communication; and my latest employment depends solely on communication with the student.
In my opinion this makes me an apropriate candidate for your job, I hope you see it the same way, and I am looking forward to your reply.