Translation of quantifizieren

How long have you being teaching Russian and why do you want to learn Spanish? Since when do you learn it? Are you traveling often and if you do in which countries? Are you from Moscow or St. Petersburg?
True, I forgot the 'I' when I have copied and pasted the entire text field. I assume it is the regular form, isn't it? However, the formal form in Spain is a little different to what we are using in Mexico.
Maybe it's just a small mistake but I think that we corrected almost all errors. But I'm not worried anyway, because you already have good language skills. Good luck with your exams tomorrow.