8.-the box isn't small enough for two boys to put away
-the box is so big that two boys can't put away
-it is such a big box that two boys can't put away
9.-the coffee is too hot for the children to drink
-the coffee is so hot that the children can't drink
-it is such a hot coffee that the children can't drink
10.-the book was too long for my son to understand
-the book was so long that my son couldn't understand
-it was such a long book that my...................................................
-the book wasn't short enough for my son to understand
-my son wasn't intelligent/clever/smart to understand the long book.
11.-it is such a hot coffee that he can't drink
-this coffee is so hot that he can't to drink
-this coffee is too hot for him to drink
-this coffee isn't cold enough for him to drink