Prepositions are also a problem and on the emergency weekend list... Fortunately I only have to make it to "rusty GCSE" level by Monday, and while I'm certainly not going to be more than that, today I managed to hit it on the placement test, which I sure as hell didn't a couple of weeks ago. Admittedly in one case it was by remembering a line from Rosenkavalier, but it still counts.