[quote=@Legend]
<Snipped quote by whizzball1>

Source.
[/quote]

Cambridge Grammar of the English Language, Chapter 5, Section 17.2.4 (specifically, pages 491-495).

Yes, I did have that saved for exactly this moment. I knew it would come. [s]not really but still[/s]

EDIT: Just in case you say "It's British so it's wrong," the Linguistic Society of [i]America[/i] awarded it with the Leonard Bloomfield Book Award, which awards a recently published book for making an "outstanding contribution to the development of our understanding of language and linguistics".