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Our busy two year old is building vocabulary at a rate of knots but "sorry" was not in it so we went for this book. It has really worked for us as the simple story shows the mouse causing mishaps (such as knocking acorns over from the squirrel's store)and then saying sorry as he realises his mistake. The pattern is repeated through the book and set against bright, colourful backgrounds wih simple senarios. Our little one loves reading it and often picks it out for story time so the message is being reinforced daily. As a result we're hearing "sorry" in context. I am thinking of getting the "Excuse Me" one for Christmas.