The language acceptance system of children aged 0-6 is open, and they can acquire language naturally. As long as there is a certain language environment, children can learn one or two or more foreign languages at the same time besides their mother tongue. Children are in the sensitive or critical period of language learning, especially the sensitive period of phonetic development. Its language imitation ability is very strong, especially in learning pronunciation, and its grasp of pronunciation is the purest. Children's language acquisition does not need indirect thinking and understanding, but a process of direct understanding and direct acceptance with the help of the language environment and the speaker's actions at that time. Webster, editor-in-chief of the world-famous Webster's English Dictionary, has been able to speak four languages since he was a child. Because he lives in a family environment where his father only speaks English to him, his mother only speaks French, his grandfather only speaks German, and his nanny only speaks Nordic mother tongue. As a result, little Webster mastered four languages without any difficulty. Children aged 0-6 have natural language advantages and unique instinctive language learning methods. As long as they are provided with a suitable English language environment, they can learn English almost without a teacher.
If children don't learn and train a second language in the critical period of language development, the regulation mechanism of children's center will be deeply influenced by the first language, so learning a second language may get twice the result with half the effort. As children grow older, they are more and more disturbed by their mother tongue, and they will rely more and more on specific motives and systematic language learning. Karl Bitter, a German educator, believes that children aged 6-8 are in a period of slow language absorption, and their learning is obviously slower than before the age of 6. Children over 8 years old are in the stage of steady decline in language absorption ability, and their thinking tends to be adult. With logical thinking ability, they make choices when absorbing, and the process is slow. When adults learn a new language, they will have a potential sense of tension and fear, and they will unconsciously show a psychological barrier, because the mature mother tongue habits that have been formed will subconsciously resist this new language. Learning English will be more difficult, and you will never learn your mother tongue well.