Vocabulary is the basis of mastering a language. Vocabulary learning is an important part of second language learning. Learners tend to spend a lot of time on vocabulary learning, but the learning efficiency is very low. Under the influence of the lexical approach, it is recognized that extracting MWEs from memory as a whole is faster than extracting the constituents of MWEs one by one, and that MWEs are formulaic and prefabricated because of their formal integrity and semantic conventionality. MWEs are the most ideal unit of language communication and the acquisition and use of MWEs is of great significance to language learners. However, there is still a lack of systematic research on Chinese MWEs based on corpus-driven and corpus-based approaches. This research has selected four sets of popular comprehensive TCSL textbooks, established relevant corpora, and systematically examined Chinese MWEs theoretically and practically. The main outcomes of this study are as follows. (1) This study proposes that the core attribute of MWEs is “prefabrication”, which defines MWEs as “a non-word language communication unit composed of two (or more) words or morphemes”. On the basis of definition, this study proposes the operating criteria for MWE identification and selection consisting of necessary conditions and sufficient conditions. The criteria are set from seven aspects, including composition, composition, grammatical analyzability, semantic standard, pragmatic standards, frequency standards, and dictionary standards.
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