This theory promoted by linguist Noam Chomsky emphasizes the innate capabilities of people. The theory states that humans have an inborn mechanism called an (LAD) language acquisition device. This device allows people to acquire the symantics of their native language. The theory also states that this is a universal phenomenon because all people's develop a language.
Vygotsky believed that children learn language through social interaction in the society in which they live. They acquire language out of a need to function in society and so they learn the many different ways in which to communicate within it. This theory focuses on the child's development of pragmatic knowledge.
The Cognitive Developmental perspective promoted by Jean Piaget says that children must be at the right cognitive level for language to develop. Piaget's theory follows the theory that when cognitively ready children develop concepts about objects. The focus is on the semantic and morphemic development of language through these concept formations.
B.F. Skinner's Behavorist theory posits the belief that children are a blank slate and learning occurs through stimulation of the child's environment. They learn semantic, syntactic, and morphemic knowledge by associations with the people and objects around them.
semantic, syntactic, morphemic