The article describes the issues faced by learners dealing with concepts beyond their understanding, be it grammar or vocabulary. An awareness of the issue might be useful to have.
This article compares the established explanations of the various tenses of English and questions their accuracy. What rules are the best to help learners?
The writer argues that it might be more efficient to have full academic understanding and competence in the first language before embarking on learning a second one. Knowledge and understanding of grammar and vocabulary may well help in the learning of a second language.