Which is not a function of reading regularly for language learners?

Reading regularly plays a significant role in a language learner's development, especially by facilitating various aspects of language acquisition. Expanding vocabulary occurs as learners encounter new words in context, helping them understand and remember these words more effectively. Improving comprehension skills is another vital function, as reading requires learners to interpret and understand the text, leading to enhanced overall understanding of the language. Furthermore, reading regularly exposes learners to different sentence structures and grammar, further enriching their linguistic abilities.

In contrast, enhancing mathematical abilities is not a function attributed to regular reading in language learning. While reading can indeed improve critical thinking and problem-solving skills, the primary focus of reading in this context is on language development rather than mathematical proficiency. This distinction clarifies why the other responses align with the core functions of reading in language acquisition, while this particular function does not apply.