Language Adquisitons Theories

Previous research related to the topic chosen.
There are previous researches on language acquisition, leading to a good way to teach a second language. These theories are:

Jean Piaget's theory that stands in the way that language is acquired through the functions that have the language in the child and these languages ​​are classified into two groups: Egocentric and socializedspeech language. These stages usually occur at certain ages of children, but each child has its own rhythm of development, everyone going to make it, that is why Piaget says the following steps in development of intelligence, which very much related to the acquisition of language, sensory-motor stage (0 to 24 months). •Stage preoperational (2 to 7 years). • Concrete Operational Stage(7 to 12years). • Formal Operational Stage (12 to 15 years). I think it's one of the most successful theories to say when a child acquires language, this means that all people from before being born already can to understand the external world and after birth in the first hours of life the child has the need to communicate.

The following Chomsky´theory, this theory says that everyone we have a "black box" that helps us toacquire language. It's like a universal intelligence. Because everyone can build words and sentences correctly after conjugation, that is because the language is for everyone because exist written and sign language.

A third theory is of Bruner about a child that not only uses language to communicate, but also to solve problems, but also means that the child needs to learn language as a blackbox that says Chomsky and where relates them with a good environment designed to learn the language, because if the child has not a motivation to learn the language, he can not to learn it, also we have need to relationship.

Also we have the Vygotsky´theory which speaks about the cultural aspects of developmnet and how they influence language acquisition. Vygotsky said that speech is a social product.Skinner's theory tries that language learning occurs through conditioning, says that first the children imitate certain words associated to actions or objects and then learning the words and grammar by operant conditioning as so called Vygotksy. This occurs very frequently in young children as 1 to 3 years that often mimic all, language is acquired more easily this way for them.

Krashen'stheory of second language acquisition consists of five main hypotheses:

I found several hypotheses about second language acquisition and one of them is the acquisition and learning speaking about the existing two strategic ways to develop a second language is like a subconscious process because on one hand, people are not aware that they are getting, because they acquires in some way in the mothernucleus or naturally.
The following hypothesis is called the natural order hypothesis this theory talks about grammatical structures. This hypothesis highlights that the first and second language is acquired very similar but not identical. This means that everyone can learn a second language, obtaining it through the same way we learned our native language in simpler way than usually startlearning courses for a second language in which we have grammar, in my opinion is not right because just what you are learning not acquired it.
A third hypothesis of second language acquisition is the hypothesis of the monitor which means the relationship between acquisition and learning. The acquisition enables fluency in a second language, this mean, he or she can use the comfortably and easily wayand otherwise the learning that is learned in a conscious way we learn it incorrectly. Is why that using learning consciously we are as correcting or rather, changing our thinking before  to speak or write so we have not flow. 
It is certainly the best way to acquire a second language by the same way you learned your native language.
The hypothesis of comprehensible input talks about...