The role of mother tongue in language understanding cannot be overstated. It is the foundation on which all other languages are built. Children learn their mother tongue naturally, without any formal instruction, by listening to their parents, siblings, and other family members speak. The mother tongue provides a framework for understanding how language works, including grammar, syntax, and vocabulary.
Research has shown that students who have a strong foundation in their mother tongue are more successful in learning a second language. This is because they have already developed the cognitive skills and language awareness that are necessary for language learning. They are also better equipped to recognize patterns and structures in the new language because they have a reference point in their mother tongue.