so...that...转换规则

so...that...转换规则
当that引导的从句为否定式时，从句主语与主语的主语相同时，so．．．that可转换为too．．．to结构；若从句主语与主句的主语不相同时，so．．．that可转换为too．．．for sb．to结构。

例如：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．当that引导的从句为肯定式时，若从句主语与主句主语相同时，so．．．that可转换为 enough to结构；若从句主语与主句主语不相同时，so．．．that可转换为enough for sb．to结构。

例如：Tom is so old that he can go to school．
→Tom is old enough to go to school．
The box is so light that the child can liftit．
→The box is light enough for the child to lift．
2．当that引导的从句为否定式时，若从句主语与主句主语相同时，so．．．that可转换为enough to的否定结构；若从句主语与主句主语不相同时，so．．．that可转换为 enough for sb．to的否定结构。

注意：转换后的形容词（副词）要用其相应的反义词。

例如：
The man is so old that he can't go to work．
→The man isn't young enough to go to work．
The desk is so heavy that I can't moveit．
→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．
ｔｏｏ…ｔｏ…结构
经典考题：
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．
4. The book is interesting enough for everybody to read.
The book is _____ interesting _____ everybody likes to read it.
5. The boy is so short that he can't reach the buttons of the lift.
The boy is _____ short _____ _____ the buttons of the lift.
The boy isn't _____ _____ _____ _____ the buttons of the lift.
6. He is old enough to go to school.
He is _____ _____ that _____ _____ go to school.
7. She was so weak that she couldn't take care of her baby.
She was _____ weak _____ take care of her baby.
Keys：
1．too，to 2．old enough to 3．easy enough 4. so; that 5. too; to reach; tall enough to reach 6. so old; he can 7. too; to。