From the text it can be inferred that:

Overly Large Classes In many countries, large class sizes (thirty to fifty students or more) are perceived as a major obstacle to the adoption of communicative language teaching or student-centered teaching approaches. For listening comprehension or reading lessons, such large classes are generally not an insurmountable obstacle; for speaking and writing lessons, however, large classes can present serious problems. In a speaking class with fifty students, you simply cannot give much individual attention to students, and writing classes of this size mean that you have to face either mountains of compositions or guilt for assigning students too little writing. Obviously, the ideal solution to this problem would be to reduce the size of the classes. Unfortunately, this is often not possible. Large classes are generally a result of necessity rather than a philosophy of education; most educators the world over would agree that smaller classes are better and would reduce class sizes if they could. So generally you need to cope with the situation instead of hoping it will change. The danger for you in this situation is that you may consciously or unconsciously assume that, with such large classes, it is impossible to use communicative language teaching approaches.