Summary: Jespersen, a renowned linguist, is praised for his erudition and imaginative approach in his works on language. His books cover various aspects of language, including grammar, syntax, and phonetics. He introduces new terms and key concepts that challenge traditional grammatical perspectives. From exploring living grammar to emphasizing the importance of comparative and historical grammar, Jespersen offers a fresh and insightful take on language study. His focus on the three ranks of words, substantives, and nexus-substantives reflects a deeper understanding of linguistic structures. Jespersen's innovative ideas extend to the theory of abstracts, tense systems, and the nominal style of language. He advocates for a more practical and living approach to teaching grammar, aiming to make it more engaging and relevant for learners of all levels. In addition to influencing advanced grammars, Jespersen’s theories hold the potential to reshape the teaching of grammar from elementary to university levels, promoting a deeper understanding and appreciation of the intricacies of language structure and meaning.