Every normal child acquires a language in just a few years. By four or five, children have effectively become adults in their abilities to produce and understand endlessly many sentences in a variety of conversational contexts. There are two alternative accounts of the course of children's language development. These different perspectives can be traced back to the NATURE VERSUS NURTURE debate ...

Language transfer shows close relevance to second language acquisition. Despite the passage of nearly a century, discussion on and role mother tongue never ceased. This paper reviews background research development transfer. It also analysis transferability its characteristics. Finally, this makes it clear implications for teaching.