7.The problems of Error Analysis (1)It is inadequate to rely on errors to study how L2 is learned.We needs to consider errors as well as non-errors to get the entire picture of a learner's linguistic behavior. (2)It is difficult to determine what an error is.E.G.: There are so many Taiwan people live around the lake. (3)Error analysis over-stresses production data and fails to account for error avoidance (the learner avoids a particular word or structure. ----Gass and Selinker,20017. The problems of Error Analysis (1) It is inadequate to rely on errors to study how L2 is learned. We needs to consider errors as well as non-errors to get the entire picture of a learner’s linguistic behavior. (2) It is difficult to determine what an error is. E.G.: There are so many Taiwan people live around the lake. (3) Error analysis over-stresses production data and fails to account for error avoidance（the learner avoids a particular word or structure. ---- Gass and Selinker,2001