Express yourself

Almost perfect. You show excellent accuracy and fluency and have used lots of difficult tenses and modal verbs which is tricky. There is just 1 structural error, i.e. " Well limits must exist, one lexical error, i.e. business and one passive voice error i.e. from being exploited. I am very impressed though, very high standard of English.

First of all, thanks for your comments. 

Secondly, I have been studying English for many years, seven years at school and high school, although I must say that in Spain, when I studied, the teaching of English was directed essentially to grammar, to learn how to write and read but with a great lack in the speaking matter. So, ten years or so later I decided that I wanted to improve my English and I took classes at a private school in which they taught the Callan Method which is very speaking oriented, I was very happy with the method and felt, for the first time, that my english studies worth something. I studied at this school for about sixteen months. Then I realized that if I really wanted to learn English properly, I must hear a lot of it, so I began to watch american and british films and TV series in their original version, so much so that I hardly watch spanish TV or films here (I don't know if you are aware that in Spain all the films are dubbed to spanish, so here is nearly impossible to watch a film on TV in English), but I downloaded films and TV series on the internet and, that way, I hear a lot of English. I have been doing that for about 7 years now, and I think that you learn a lot just hearing, sometimes without even noticing it. 

And that lead us to today, in which I am very happy of read your comments about my english, I feel that all the process was worthwhile. Thank you very much!