Thank you @chris-richards we will look into collocations and collocational differences in Units 3 and 4, so hopefully our guides and tasks will give you an idea how to approach this corpus technique in the classroom. Regarding error correction, I could perhaps suggest a couple of readings I found enlightening when it comes to the use of corpora for error correction.
Dolgova, N. and Mueller, C. (2019) ‘How useful are corpus tools for error correction? Insights from learner data’, Journal of English for Academic Purposes, 39, pp. 97–108. doi:10.1016/j.jeap.2019.03.007.
Satake, Y. (2020) ‘How error types affect the accuracy of L2 error correction with corpus use’, Journal of Second Language Writing, 50, p. 100757. doi:10.1016/j.jslw.2020.100757.
You can search StarPlus (via MUSE – My Services), but let me if you have any issues and I can share the PDFs with you.