Well, he wrote a book on this topic http://www.amazon.com/Cambridge-Grammar-English-Language/dp/...

Edit: and they're kind of shy:

"Our aim is to describe and not prescribe: we outline and illustrate the principles that govern the construction of words and sentences in the present-day language without recommending or condemning particular usage choices. Although this book may be (and we certainly hope it will be) of use in helping the user decide how to phrase things, it is not designed as a style guide or a usage manual."