Question

What happens to someone when they cannot speak their own mother tongue​

Answer 1

Answer:

no it's not possible because every child can speak the language that his mother speak and it is known as mother tongue

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Answer 2

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It usually happens because of assimilation of people having some native language with the group of others who speak another language. ... At first, they can't speak their native tongue and become able only to understand the native language. After some generation, they can't even understand their native language.