Maksi, I have friends, coworkers and acquaintances from all over the world, and I can tell you that your written English is VERY good! Much better than my French!
That being said, I can understand your struggle to write a foreign language correctly. Correct congugations, tenses and idioms are HARD! In fact, even though there are so many people here in Texas whose native language is Spanish, I know of a business who had a very difficult time hiring someone who could write Spanish correctly. Of course I know even more Americans who can't write English correctly either!!
Your English writing is just fine! Rather than having us correct you, if you come across something that someone writes that you don't understand, ask THEM to explain it to you. I'll be willing to bet that 99.9% of the time it is an idiom, local colloquialism, or just plain incorrect! LOL
Now, I need to go listen to my Champs Elysee CD's some more!