Academic English phrasing
There are many books on academic writing methods, but not many that look comprehensively at common phrases used in research writing. This University of Manchester (UK) website looks useful:
The site 'aims to provide you with examples of some of the phraseological ‘nuts and bolts’ of writing organised according to the main sections of a research paper or dissertation'...and states that 'the items in the Academic Phrasebank are mostly content neutral and generic in nature'.
Topic headings include: Being Critical, Being Cautious, and many more. Each topic is introduced by an overview of usage for the topic. I highly recommened reading these passages and also the main introduction here: About Academic Phrasebank.