Thank you crazYgeek for the source
Thank you all. I now know what to do with that method. Hihi!
Thanks a lot !
In my opinion, learning the book grammar can be important too. It depends on what you want to do with your newly learned language. If you want to write serious philosophical books in English, you should know the standard, codified grammar. If you want to make gangster movies' scripts in English, you probably don't have to do it. But it's only my opinion, which I find a little bit hard to justify actually...