摘要：Interlanguages, which defined as the features of languages between first language and second language (L2), help to explore the nature of L2 study. The paper is twofold. The first attempts to review and explore the nature and properties of interlanguages. The second is to introduce basic methods in the study of interlanguages. These attempts may have some implications for L2 acquisition study.
关键词：interlanguage; nature and property; L2 acquisition
