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The role of filtering the new input increases as the learner have sufficient comprehensive input.
At later stage, when the second language learner masters a lot of L2 rules and have reached the advanced language proficiency, filtering becomes subconscious process.
It is said that, error correction hinders the language development with a feeling of continues anxiety governed by error phobia .
Whether such feedback has this effect on the acquirer to a significant degree or not remains an open question (Fanselow, 1977; Long, 1977).
Yet, second language grammar should not be taught as it is supposed to be acquired in this natural order.
This hypothesis states that acquiring an L2 will be developed automatically allowing the acquirer to monitor his new language grammatical rules and edit the mistakes unconsciously at some stage, which we will see later as “the Monitor”.Krashen’s theory of SLA is also called the “input hypothesis”, which answers the question of how a target language acquirer develops competency over time.It states that a language learner who is at “i level” must receive sufficient and logical input that is at his level “i” and a new “ 1”.They both require a meaningful interaction, authentic communication in which speakers are paying the most attention for conveying and understand the message rather than the form of their utterances.Error alteration is more likely not so important and teaching grammar is not applicable to acquiring a second language.Krahsen has developed his theory of second language acquirers who are assumed to have two autonomous systems for improving their ability in acquiring a second language and aware of the language learning.So, these systems are interconnected in an explicit way where unconscious acquisition seems to be more vital as it takes place naturally.Monitor Under-users either have not intentionally learned or decide to not use their aware information of the language.Even though the modification of errors by others has little effect on the learners, they can frequently correct themselves, later on, based on a good judgment for correctness.Fillmore and Snow, 2002 and Hamayan, 1990 stated that teachers can play a positive role in improving second language acquisition if they understood how to improve the learners’ ability of majority.This paper will be devoted to Stephen Krashen’s second language learning acquisition theory.