This document provides a preface for the first edition of the Basic English IV textbook. It explains that this book has become a guide for fourth year students, serving as an open resource for language learning. Previously, guides or separate handouts were used as working tools, but the topics have now been structured into the book according to grammar units for better learning. The student does not need prior knowledge of vocabulary or grammar syntax for each topic - they can orient themselves using images, dialogues and sentences. The content covers basic and fundamental knowledge for students' career training.