【正确答案】Interlanguage refers to the language that a learner constructs at a given stage of a second language acquisition．It includes a series of internal representations that comprises the learner’s interim knowledge of the target language．As a type of linguistic system in its own right，interlanguage is a product of the second language training，mother tongue interference，overgeneralization of the target language rules，and learning and communicative strategies of the learner．