Words like treasure, measure etc. She's not happy with my "oh that's just one you have to remember" explanation that worked perfectly well for my older kids when we come across words that I don't know how to sound out. She's quite cross at the idea and has told me "every word can be sounded out if you know the rules"... So can someone give me the method for getting the "s" in these words to sound as a "sh". Sure it's pretty obvious but I can't work it out at the time of the morning!