Second language acquisition theory

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Five Components of Second Language Acquisition Theory
There are five main components of Krashen’s theory. Each of the components relates to a differentaspect of the language learning process. The five components are as follows:
• The Acquisition Learning Hypothesis
• The Monitor Hypothesis
• The Natural Order Hypothesis
• The InputHypothesis
• The Affective Filter Hypothesis
The Acquisition-Learning Hypothesis
This hypothesis actually fuses two fundamental theories of how individuals learn languages. Krashen has concludedthat there are two systems of language acquisition that are independent but related: the acquired system and the learned system.
• The acquired system relates to the unconscious aspect oflanguage acquisition. When people learn their first language by speaking the language naturally in daily interaction with others who speak their native language, this acquired system is at work. In thissystem, speakers are less concerned with the structure of their utterances than with the act of communicating meaning. Krashen privileges the acquired system over the learned system.
• The learnedsystem relates to formal instruction where students engage in formal study to acquire knowledge about the target language. For example, studying the rules of syntax is part of the learned system.
TheMonitor Hypothesis
The monitor hypothesis seeks to elucidate how the acquired system is affected by the learned system. When second language learners monitor their speech, they are applying theirunderstanding of learned grammar to edit, plan, and initiate their communication. This action can only occur when speakers have ample time to think about the form and structure of their sentences.
Theamount of monitoring occurs on a continuum. Some language learners over-monitor and some use very little of their learned knowledge and are said to under-monitor. Ideally, speakers strike a balance...
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