Abstract:

Language teachers are always trying to make full use of positive transfer of native language，and avoid the negative one. To achieve this，they are supposed to know the students' native language quite well. Maybe，that is not enough because during the process of language acquisition，not only the native language habit could transfer but also the non-native language habit transfer often occurs. A research only based on native language transfer，regardless of the transfer of non-native languages could be misleading.

Key words: non-native language transfer, language acquisition, multi-language background