3. 
⇒ He wasn't have enough money to buy the flat. 
⇒ The flat wasn't cheap enough for him to buy it. 
⇒ The flat was too expensive for him to buy it.  
4. 
⇒ The trouser aren't fit enough for her to wear it. 
⇒ The trouser are so large for her to wear it.  
5. 
⇒ The exercise is too difficult that all students can't do it correctly. 
⇒ The picture is not easy enough for students to do it correctly.  
6. 
⇒ The test is too long that most students can't finish it on the time. 
⇒ The test isn't short enough that most students can't finish on time.
7. 
⇒ The apple is so high that the boy cannot tough it. 
⇒ The apple isn't short enough for the boy to touch it.
 8. 
⇒ The box isn't small enough for two boys to put it away.  
⇒ The box is so big for two boys to put it away.
9. 
⇒ The coffee is too hot for the children to drink. 
⇒ The coffee is so hot that the children cannot drink it.
#NOCOPY