Logic and rhetoric
People who come from a non-Western language background, have a much tougher time learning English. They do not have the Latin and Greek based vocabulary that is common to so many European languages.They have also not been exposed to the Western way of thinking that is behind much of the reading that we all do in school. The origin of the Western way of expressing ideas lies in the classics of ancient Greece and Rome, which have inspired centuries of Western literature and influenced how we express ourselves.
I have found a web site which I would recommend to any person of non-European background as an excellent place to become familiar with the theories of classical rhetoric. Here‘s the link. Spend some time studying this content and the different techniques of conveying ideas and persuading others. I think it will be quite helpful. It is recommended for advanced learners.