问题：

What's the difference between acquisition and lear

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答案：

According to Krashen, acquisition refers to the gradual and subconscious development of ability in the first language by using it naturally in daily communicative situations. Learning, however, is defined as a conscious process of accumulating knowledge of a second language usually obtained in school settings. A second language, Krashen argues, is more commonly learned but to some degree may also be acquired, depending on the environmental setting and the input received by the L2 learner. A rule can be learned before it is internalized (i.e., acquired), but having learned a rule does not necessarily prevent having to acquire it later. For example, an English language learner may have learned a rule like the third person singular "-s", but is unable to articulate the correct form in casual and spontaneous conversation because the rule has not yet been acquired. This shows that conscious knowledge of rules does not ensure an immediate guidance for actual performance.