8/10. Never heard of that gerund one, and that modal thingy, pass too. I didn't understand half the jargon used in any of it nor should anyone be expected to. It is clear what should be right and wrong though!
I would punch anyone that said "the car which ran me over" just like I would someone who said "the car wot ran me over, innit"
I agree with what was said about "if you can understand it" - for instance, that Hilary one is easy to spot if male/female from the grammar but anyone writing or speaking like that would be punched in the nads too.