THE GRAMMAR RULES ARE VERY IMPORTANT IN WRITING OF ANY LANGUAGE, BECAUSE THEY FACILITATE LEARNING OF IT AND IN TURN ALLOWS US TO KNOW HOW TO DO IT CORRECTLY AND WITHOUT INCURRING MISSPELLINGS AND WRITING. THE NATIONAL EDUCATION SYSTEM ESTABLISHES ENGLISH AS THE COMPULSORY FOREIGN LANGUAGE WITHIN THE CURRICULUM.THE RESEARCH WAS CARRIED OUT IN THE "DR. CAMILO GALLEGOS DOMÍNGUEZ" EDUCATIONAL UNIT WITH THE STUDENTS OF THE 9TH YEAR OF BASIC, TO KNOW ABOUT THE GRAMMATICAL RULES AND THEIR INCIDENCE IN THE LEARNING OF THE WRITING OF ENGLISH LANGUAGE. WE USED THE RESEARCH TECHNIQUES OF THE SURVEY AND INTERVIEW.