This paper by Quang Phuc Dong* of the South Hanoi Institute of Technology** begins “There is an extensive literature dealing with English imperative sentences. As is well known, these sentences have no overt grammatical subject…” and ends “… it is clearly no accident that many quasi-verbs are homophonous with normal morphemes.” However, it is no ordinary linguistics paper, and if you don’t at least skim it you’ll be missing out on some great example sentences. And if you actually read it, you’ll learn interesting facts about some very common words.
*There is no such person.
** There is no such institution.
If you scroll all the way down past the paper itself [my original link is dead, but you can find this text here], you will find the following among other elucidations:
“Quang Phuc Dong” is a nom de guerre (linguistique)… of James D. McCawley, who “created the interdisciplinary field of pornolinguistics and scatolinguistics virtually on his own.”