so．．．that，too．．．to和enough to
1．The water was so dirty that we couldn't drink it．
The water was ____ dirty for us ____ drink．
2．The child is so young that he can't put on his clothes．
The child isn't ____ ____ ____ put on his clothes．
3．The problem is too difficult for me to work out．
The problem isn't ____ ____ for me to work out．
一、so．．．that与too．．．to的转换
He is so young that he can't go to school．→ He is too young to go to school．
The box is so heavy thathe can'tliftit．→The box is too heavy for him to lift．
二、so．．．that与enough to的转换
1.Tom is so old that he can go to school．→Tom is old enough to go to school．
2.The box is so light that the child can lift it．→The box is light enough for the child to lift．
3.The man is so old that he can't go to work．→The man isn't young enough to go to work．
4. The desk is so heavy that I can't move it．→The desk isn't light enough for me to move．
三、enough to的句式为否定式时，enough to可以转换为too．．．to结构。

但转换后的too．．．to结构中的形容词（副词）要用其相应的反义词。

例如：
He is not old enough to do the job．→He is too young to do the job．
Tom didn't walk slowly enough for us to keep up with him．→Tom walked too fast for us to keep up with him
1. The girl is too short to get on the elephant. (改为同义句)
①The girl _________________________ to get on the elephant.
②The girl ____________that she ___________ get on the elephant.
③The elephant _______ that the girl_______ get on it .
④The elephant _________ enough ______ the girl ______ get on.
⑤The elephant __________tall ______ the girl _______ get on.
2. The girl was too short to get on the elephant. (改为同义句)
The elephant_______ that the girl______get on it .
3. He ran very fast. He couldn’t stop.
He _____________to stop.
He ______________that he________stop. (方法是句型转换时要注意时态一致。

)
4. My brother was so clever that he could work out the problem. (改为同义句)
My brother __________________________ work out the problem.
5. The box isn’t light enough for him to carry. (改为同义句)
The box ________________________ for him ________ carry.
6. He is very short . He can’t reach the book on the shelf.(合并为一句)
He is ________________________ reach the book on the shelf.
7 The water was so dirty. We can’t drink it. (改为同义句)
The water was too __________________________________ .
8. The water in this river is very dirty. Fishes can’t live in it.
The water in this river is ____________ that fishes ___________ in it.
9. My brother got up late yesterday. He was late for school.
My brother got up ________ that__________
10. Mr. King is very busy at work. He can’t take a holiday.(改为同义句) Mr. King is ______________________ take a holiday.。