hello **** Chun, Your sentences are not "bad" in themselves, but they do need a bit of polishing. 1 - "Disadvantages of sports are less than advantages of sports for children in my book. " You could reput it this way: In my book, there are many more advantages than disadvantages resulting from the practice of sports for children .
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.