English Grammar A1 Level: This book is the Grammar section of the A1 level of the practical guide for learning English as a second language. It forms a part of the  book series My English Skills. It is fully written in English, and it  serves as a base for the adaptation to different mother tongues.  Starting from an integrated curriculum of languages, we offer an  eclectic system with a distribution of contents based on the needs of  learning objectives.

https://open.books4languages.com/english-a1-grammar/front-matter/introduction