Verb conjugation of "dismount" in English

I have contacted you 12 months ago to propose your school's inclusion in our language school directory. I wanted to inform you that our site achieved high positions in search engines last month.
Everything in your letter is perfect! Almost no errors and the writing style, very impressive! After this first year in England, you have also improved your vocabulary and the grammar skills.
Hi there again. I would love to visit you very much. I will keep that in mind for our next vacation... Your English is very good and I can't imaging that you have just learned it for two years.