Research show that:The main error types were the wrong sequence, omission and misusage;The negative transfer of mother tongue and knowledge's generalization of the target languages were the main reasons which resulted the errors.
研究发现:错序、遗漏及误用等是主要的偏误类型;母语语法知识的负迁移和目的语知识的泛化是造成偏误的主要原因。