The five second language acquisition stages, from preproduction to advanced fluency, with the typical timeline, vocabulary size and what each stage sounds like.
Stephen Krashen's theory of second language acquisition: the five hypotheses (acquisition-learning, monitor, natural order, input, affective filter) explained.
Second language acquisition defined: what the term means, acquisition vs learning, L1 and L2, one classroom example, and where to go for theories and stages.
Second language acquisition: the theories (Krashen, Swain, Long, Cummins), the stages, comprehensible input and output, and what it means for the classroom.
