Over the decades, research on heritage language learners has been quite popular, but most studies concern Russian, Spanish and other languages rather than Chinese. The Chinese heritage language learner's studies focus mainly on K-12 students and their learning motivations, writing characteristics, and identification recognition and those concerned with language acquisition address their vocabulary and verbal Chinese development. There have been very few studies about learning grammar. This

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... emphasizes on the acquisition of the aspect marker LE among advanced learners. To investigate the acquisition characteristics of advanced CHL learners, this study adopted the advanced CHL learners as the research group and the advanced CFL learners and native speakers as the control groups. A questionnaire survey was designed to investigate the participants' acquisition abilities. The survey utilized "similar semantics, different contexts, and English similarities" related to the aspect marker LE as the interference factors to investigate comprehension abilities and presented five different situations of using LE to investigate production abilities. There were 198 participants in the survey, and 183 effective questionnaires were collected. Analysis of the data showed the following results: all three groups of subjects are equally affected by "similar semantics" and "different contexts" in comprehending the meaning of LE. But CHL and CFL learners are more affected by English interference than NS. In the production survey, CHL learners did better than CFL, but not as well as NS. In terms of comprehension on the aspect marker LE, CHL learners did better than CFL, but not as well as NS. The understanding and production abilities of CHL learners in the United States are better than those of CHL learners in China, and the influence of English on both CHL groups is quite similar. The most important findings of this research are as follows: (1) Even when CHL learners reach the advanced level, they behave nearly native-like at [...]