1. He is tired. He can't go to school.

-> he is tired enough for him not to go to school

2. He is very stupid . He can't understand this matter.

-> he is intelligent not enough for him to understand this Matter

3. this book is very difficult . I can't read it

-> this book is easy not enough for me to read it

4. these exercises are very hard . She can't do them

-> these exercise are hard enough for her not to do them

5.she was too busy . She had no time for games

-> She was busy enough for her not to have no time for games

6.this hat is very small . I can't put it on

-> this hat is big not enough for me to put it on

7. he was so poor . he couldn 't buy this house.

->he was rich not enough for him to buy this house.

8. the sound is very low . we can't hear it

->the sound is hight not enough for us to hear it

9.this book is very expensive . we can't hear(sai)->buy it

->this book is cheap not enough for us to buy it.