1.why fossilization occurs in second language learning.

1.Because we don't use it frequently,and there isn't a proper environment for us to learn it well.One day when we use it as our mother tongue,we won't have this probelm.And the mode of thinking,culture may also effect.
2.language environment,speech performance,analysis of dialogue,accommodation.
By the way,what's your major?
再问： 计算机
再答： 哦，那你问的问题这么专业是你喜欢语言？