I would say applying some stylometry on students’ written tasks would be a very interesting topic. If you wish, see the study on teenagers’ essays on my profile.

The attachment, also linked below, renders suggested relevant topics by Dr. Beate Seidel of Leipzig University. You might go through them and consider what suits you.

https://www.philol.uni-leipzig.de/fileadmin/Fakult%C3%A4t_Philo/Anglistik/Studium/Pr%C3%BCfungen/Abschlussarbeiten/themen/themenvorschlaege_linguistik_01.pdf

In addition, you could consider the guide for researching corpus linguistics suggested by Pérez-Paredes (2021) and the one proposed by Stefanowitsch (2020). Both are referenced below.

Pérez-Paredes, P. (2021). Corpus linguistics for education: A guide for research. Routledge/Taylor & Francis Group. https://www.routledge.com/Corpus-Linguistics-for-Education-A-Guide-for-Research/Perez-Paredes/p/book/9780367198435

Stefanowitsch, A. (2020). Corpus linguistics: A guide to the methodology. https://refubium.fu-berlin.de/handle/fub188/27138

Good luck,

http://www.academypublication.com/issues2/tpls/vol08/11/11.html

Check my paper here on creative writing assisted by corpora.

I am gathering information, since I want to articulate English reading comprehension over (without) grammar or pronunciation; in order for no english speakers to read science papers. What do you think about my project? and how does it work for your question?

Cheers

AB