Look at the article of Marais and Wilken (2022) Morphology-based investigation of differences between spoken and written isiZulu
3.2 You create research questions that the authors of this article could have used to reach the conclusion of their work, if they did not analyze the nature of the documents.
1. How do native isiZulu speakers perceive the differences between spoken and written isiZulu?
2. What are the commonalities and variations in lexicon usage between spoken and written isiZulu?
3. How do the grammatical structures differ between spoken and written isiZulu?
4. Are there distinct stylistic features in spoken and written isiZulu that contribute to the differences in morphology?
5. How does the use of tone and intonation differ in spoken and written isiZulu?
6. To what extent do cultural norms and social contexts influence the linguistic differences between spoken and written isiZulu?
7. What role does language register play in shaping the differences between spoken and written isiZulu?
8. How do language planning and policy impact the development and maintenance of spoken and written isiZulu?