What is advanced fluency in English language acquisition characterized by?

Advanced fluency in English language acquisition is characterized by children's proficiency being similar to that of a native speaker. This level of fluency showcases the individual's ability to understand and produce complex language structures, engage in nuanced conversations, and utilize idiomatic expressions effectively. At this stage, children can express themselves clearly, understand subtleties, and use language in various contexts with a high degree of accuracy and fluency, much like their native-speaking peers.

In contrast, the other descriptions do not adequately capture the characteristics of advanced fluency. Mastering basic conversational skills pertains to early stages of language development, while communicating only with short sentences indicates a limited grasp of English. Lastly, exhibiting a heavy accent does not determine language proficiency but may reflect an individual's first language influence, not necessarily advanced fluency.