Key features of academic writing
https://www.rlf.org.uk/resources/academic-writing-key-features/
(Royal Literary Fund)
Different varieties of essay and writing
https://www.rlf.org.uk/resources/different-varieties-of-essay-different-kinds-of-writing/
(Royal Literary Fund)
Manchester University Phrasebank – comprehensive list of academic phrases
http://www.phrasebank.manchester.ac.uk/
(University of Manchester)
Conventions of academic language
https://www.sheffield.ac.uk/academic-skills/study-skills-online/academic-writing#language
(University of Sheffield)
Purpose of academic language, with activities
https://www.monash.edu/rlo/research-writing-assignments/writing/features-of-academic-writing/academic-language
(Monash University)