Kumon My Book of Sentences

I just brought this book for my 7 yr old that is building his skills on writing sentences independently. We also own the My Book of Writing Words: Learning about Consonants and Vowels (Kumon Workbooks) and My Book of Simple Sentences: Learning about Nouns and Verbs (Kumon Workbooks). Although this book is recommended after the other two, I am actually going to use this book first, then the "Writing Words", and then the simple sentences. The nouns in this book are a mixture of long and short vowels, but one syllable words. It also contains a lot of the helper adjective words that are in the Dolch list (eg. big, little, short, long, etc). The "Writing Words" book contains a lot of blend sound words, but no helper words or sentences. The simple sentences book has only nouns and verbs in the sentences, but the nouns are more complex: eg. kangaroo. I give all three books 5 stars. I just disagree with the order that Kumon recommends.