Abstract
the richness of theories in the scope of second language acquisition,playing an important role in the language teaching activities.Among them,especially the critical period hypotheses,the“i + 1 theory” as well as the inter language theory,on one hand,they would give some heuristic to the arrangement of teaching activities,on the another hand,the cohesion between the primary and middle school can be more reasonable.Through the exploration of these three assumptions in SLA,this article aims at synthesized effect of teaching activities through English teaching in primary school to those in the middle school.
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