Reasons for teaching too much grammar. 1. Because it’s there. The coursebook or the syllabus has a comprehensive set of structural topics, and teachers may feel they have to cover everything. So lots of class time gets used up in a mostly unsuccessful attempt to get students using all these structures correctly, and there isn’t much time left for anything else. The result: students are doing grammar instead of learning English.
Источник: Too much grammar, not enough grammar