第二语言学习者在讲话中所犯的一些错误源于他们的母语。例如,说西班牙语的人在学习英语时可能会说“Is raining”(省略了句子的主语)而不是“It Is raining”。第一语言对第二语言的这种影响被称为负向语言移转。然而,说法语的人在学习英语时,通常不会犯同样的错误(在“it is raining”中省略“it”)。这是因为在西班牙语中主语可以被省略,而在法语中则不能。以法语为母语的人在说英语时知道要使用代词句子主语,这是一个正向语言移转的例子。需要注意的是,错误的方式不尽相同;即使两个具有相同母语的人学习相同的第二语言,他们仍然有潜在可能利用母语的不同部分。同样地,这两个人可能在不同形式的语法上发展出近乎母语的流利度。
^Krashen (1982) made a sharp distinction between learning and acquisition, using learning to refer to the conscious aspects of the language learning process and acquisition to refer to the subconscious aspects. This strict separation of learning and acquisition is widely regarded as an oversimplification by researchers today, but his hypotheses were very influential and the name has stuck.
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