Boy Nine is now in a position to correct my grammar -- when I'm speaking Dutch. Yesterday he put me straight when I tried to say, "At five o'clock we have to be home to get changed".
"Om vijf uur moeten wij thuis zijn om ons om te kleden" -- three instances of the word "om" in three different senses: at (a time)/in order (to do something)/around (verb prefix).
I think you'll agree the sentence was pretty tricky, but still, it can only be humiliation from here on.