Action means an increase in verbÂ
c. Relations and distinctionÂ
It is meant to increase the number of qualifying and relational words (Ingram & David, 1989).Â
Third period. Stern makes a classification that children can be more comprehensive in their language development: a) Sentences are better when they include terms for structural models relationships, such as "subject and object.", b) The acquisition of intonations starts and can take years to complete ., c) Syntax is the flexible connecting of words together in which the order of the words can change., and d) The number of questions increases. And finally, there is the fourth period.Â
This stage will; 1) Hierarchical structure and the acquisition of embedded or subordinate sentences replace the juxtaposition of words in syntax., 2) Some grammatical morphemes are currently being acquired., and 3) Time and causality are now among the child's concerns. However, a more in-depth study of children during the fourth period. Suppose a 3-year-old child does not yet have his own words such as "baba," "Mama," "Papa," "Bubu," and others. Usually, children are easier to speak with words that have the letter "M" because "M" is the easiest letter to pronounce. That is, the child has problems in acquiring language. The preliminary stage triggers problems like this. To solve this problem, parents must talk to the baby from when he was born. Therefore, children who are three years old should have their own language.  In other words, at least they must be able to pronounce 3–4 words, pronouns, and others.Â
Language ComprehensionÂ
Understanding language is considered a trait that requires unique mechanisms to deal with it. Chomsky gives an illustration that understanding language depends on its productivity. Taka (2008) claims that language understanding will be more complex than language acquisition. Then, Scovel (1980) added, understanding language is the task of the processes that language recipients will achieve. In addition, brain development also affects a person's language development. As stated by Scovel, claims about phoneme opinion is considered easier than vocabulary acquisition.Â
When exploring knowledge related to language comprehension, psycholinguistics  provides components that can not be avoided:Â
a. Speech processingÂ
Speech processing is a form of representation of sound signals transmitted to the brain. Â This process is in the form of sensory input such as hearing, phonetics, and phonology. b. Lexical ProcessingÂ
Lexical processing is a form of adding vocabulary from various related information. Â Marslen-Wilson (1990) states that the lexical representation will accept the appropriateÂ