This paper introduces a set of English grammar symbols that the author has developed to enhance students’ understanding and consequently, application of the English grammar rules. A pretest-posttest control-group design was carried out in which the samples were students in two girls’ senior high schools (N=135, P ≤ 0.05) divided into two groups: the Treatment which received grammar lessons with grammar symbols; and the Control which received grammar lessons without the symbols. The experiment lasted for 30 hours spanned in three months. The statistical test revealed a significant higher gain scores for the Treatment group. Thus, the author strongly recommends using these symbols (or similar ones with the same characteristics) at least for two reasons. Firstly, students do not have to memorize all of them (72 tense symbols and 50 other symbols). That is, with just a few rules to learn, and then applying the existing algorithm, other symbols are easily shaped. Secondly, using these symbols enables teachers and students to have a general idea as to what to expect next because several grammatical rules and formulae can be predicted in advance.