Abstract:
The research objectives of this paper are the following:
1. To provide a comprehensive understanding of the role of function words 
in language use and comprehension.
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2. To examine the grammatical function, usage patterns, cognitive 
processing, historical evolution, and practical implications of function words.
3. To investigate practical applications of our understanding of function 
words, including optimizing their use in communication, language learning and 
teaching, and natural language processing.