Phrasing Claims and Conclusions for Readers of Science Materials [1]

 

Conventional signals that carry agreed-upon meaning in the scientific community

suggest show
indicate demonstrate

 

Qualifiers used to note limitations or special conditions

possibly certainly hypothetically may should
probably without doubt maybe might must
very likely presumably so far as the evidence suggests would can
necessarily in all probability as far as we can determine could shall

[1] A. Penrose and S. Katz, Writing in the Sciences: Exploring Conventions of Scientific Discourse. New York: St. Martin's Press, 1998, pp. 60-61.