Okay so occasionally the program breaks when the 'grammar' option is clicked, just restart the page and do it again - sozzles! I'll eventually fix it all, but the problem isn't in only one place, there are a few paths which lead it to destruction :o while we're at it, some of the grammar answers are just wrong, so if something looks like it shouldn't be the right answer, check! (Getting a computer to do morphology is harder than you'd think...)