The person who writes the letters at my DS's Beaver Scout group has no idea how to use apostrophes. Basically, if the word ends in an s, she puts an apostrophe before it. It's driving me mad; I've just filled out the form to return his subs for this half-term and I had to sit on my hands to stop myself getting out my red pen and correcting the following:
I enclose £21 for 7 weeks of Beaver's up to Easter.
At least there wasn't one in 'weeks', I suppose. But am I the only one who can't understand why apostrophes seem so difficult to use correctly for some?