Why am I learning English

I’ve been working in Information and Communication Technologies for the last 18 years. In my profession almost everything that I read is in English and sometimes I even have to write in it. In Portugal the Movies and Series in on TV are not translated from the original language, they are subtitled, and as you can imagine a lot of them came from America. I’m telling you all this to conclude that I have a good understanding on of the English language….Wrong. Two or three weeks ago I have had a job interview for a multinational company with a nice English lady, and at the end she tell told me that my English is not enough for working in such that company. Of course, that I didn’t liked like she’s her conclusion, but she was right. Although I knew it, sometimes we really need a push to take the decision to make the changes. So I’m looking forward to really learn English.

I think you're doing really well. Most of these errors can be corrected quite quickly. Your underlying knowledge seems very good. Take care with the past tense. Use 'have been' - the present perfect tense - to talk about a period in the past which continues to the present day.

I have been studying Portuguese for three years. 

Don't use the past tense of the verb after 'do,does,did'. Just use the unconjugated verb.

I went to the UK.

I didn't go to the UK.

I liked her.

I did not like her.