In the development of schools in ancient India, the teaching system of "word of mouth" was quite common. This teaching system takes oral teaching as the main form, and teachers impart knowledge to students through oral English. Students need to listen to the teacher's explanation and memorize it, and then consolidate what they have learned by reciting and memorizing.

In ancient India, the main purpose of education was to cultivate good citizens and devout religious believers. Therefore, the teaching content often includes religious classics, moral norms, cultural traditions and various practical skills. Teachers usually choose suitable teaching content for students according to their different backgrounds and learning abilities.

Oral English teaching system has a long history in ancient India. As early as the Vedic era (about 65438 BC+0500 BC-500 BC), a special group of teachers and students appeared in ancient India. These teachers are called "Porvari", and they are responsible for imparting religious classics and secular knowledge. Students come from different social classes, including nobles, businessmen, craftsmen and farmers.

In schools in ancient India, teachers usually used various methods to teach students. In addition to simple oral explanations, they will also use charts, images and physical displays to help students better understand the teaching content. In addition, teachers will verify their own theories through observation and experiments, thus ensuring the teaching quality.

There are also some problems in the "word of mouth" teaching system in ancient India.

Because the teaching content mainly depends on the teacher's oral explanation, it is difficult for students to independently verify and think about what they have learned. In addition, due to the lack of a systematic evaluation system, it is difficult for teachers to understand students' learning progress and mastery.

Nevertheless, the teaching system of "word of mouth" still occupies a dominant position in ancient Indian schools. This teaching system has made important contributions to the inheritance and development of ancient Indian culture, and also laid the foundation for the later Indian education system.

In addition to the "word of mouth" teaching system, there were other forms of educational institutions in ancient India, such as "Gurukula" and "Vidya Mandir". These educational institutions are usually funded by temples or nobles to provide students with a more systematic and comprehensive education. In these institutions, students can not only learn religious classics and moral norms, but also learn various practical skills and cultural knowledge.