Introduction The critical period hypothesis is under investigation. The problem here is simple: it will exist. If so, how much does it affect proficiency in the second language? Many studies seem to prove the existence of this important hypothesis. Because it is evident that adults can not successfully achieve localization skills after adolescence. On the contrary, some of the deceased learners can achieve fluency similar to their mother tongue, so some people think that there is no reason to assume this.
Learning the second language is always the focus of linguists and researchers in the field of education. It emphasizes the process and the theory that the learner acquires the second language. The second language acquisition aims to understand the development of the second language acquisition of the second language learner. By acquiring the knowledge of second language acquisition, the teacher can provide effective guidance to the students. I can not deny that I have much knowledge of second language acquisition.
Second language acquisition (SLA), second language learning, or L2 (language 2) acquisition is the process by which people learn a second language. Second language acquisition is also a science field devoted to studying this process. The second language acquisition field is a sub-field of applied linguistics, but we also receive research in various other fields such as psychology and education. The central theme of SLA research is interlanguage and the language used by learners is not only the result of the difference between the languages they already know and the languages they are learning but also the complete language system. It has its own authority and has its own system rule. When a learner touches a target language, this inter-language language develops gradually.
Learning and learning of the second language is defined as acquisition and acquisition of the second language once mastering of the mother tongue or first language is established. Second language acquisition (SLA) is a process of learning other languages in addition to their mother tongue. For example, children speaking their mother tongues begin learning English at the beginning of school. I will learn English through the learning process of the second language. In fact, young children can learn second language earlier than adults learn the same language.