Grammarians are like mathematicians - they are boring all the time! Decent people attend to the roses in their garden while they can do nothing better than claiming and explaining why n actants in S make up a minimally complete sentence with a P requiring n=x actants.
In practice, this means:

A sentence like John gives Mary a book John, Mary and a book are actants, P(redicate)requires these three actants to make a minimally complete sentence where n = 3.

Grammar here is explained in terms of Mathematical Function Theory!

Oh my God, why hast Thou punished this sinful world with grammarians and mathematicians? They are so boring!

LOL