3. He wasn't able to buy the flat.
The flat wasn't cheap enough for him to buy.
The flat was so expensive that he couldn't buy it.
It was such an expensive flat that he couldn't buy it.
4. The trousers aren't small enough for her to wear.
The trousers are so large that she can't wear them.
5. The exercise is to difficult for all students to do it correctly.
The picture is not easy enough for all students to do it correctly.
This is such a difficult exercise that all students can't do it correctly.
6. It is such a long test that most students can't finish it on time.
The test is too long that most students can't finish it on time.
The test isn't short enough for most students to finish it on time.
7. It is such a high apple that this boy can't touch it.
The apple is so high that this boy can't touch it.
The apple isn't short enough for this boy to touch it.
