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當(dāng)that引導(dǎo)的從句為否定式時，從句主語與主語的主語相同時，so．．．that可轉(zhuǎn)換為too．．．to結(jié)構(gòu)；若從句主語與主句的主語不相同時，so．．．that可轉(zhuǎn)換為too．．．for sb．to結(jié)構(gòu)。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與enough to的轉(zhuǎn)換

1．當(dāng)that引導(dǎo)的從句為肯定式時，若從句主語與主句主語相同時，so．．．that可轉(zhuǎn)換為 enough to結(jié)構(gòu)；若從句主語與主句主語不相同時，so．．．that可轉(zhuǎn)換為enough for sb．to結(jié)構(gòu)。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．當(dāng)that引導(dǎo)的從句為否定式時，若從句主語與主句主語相同時，so．．．that可轉(zhuǎn)換為enough to的否定結(jié)構(gòu)；若從句主語與主句主語不相同時，so．．．that可轉(zhuǎn)換為 enough for sb．to的否定結(jié)構(gòu)。

注意：轉(zhuǎn)換后的形容詞（副詞）要用其相應(yīng)的反義詞。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的句式為否定式時，enough to可以轉(zhuǎn)換為too．．．to結(jié)構(gòu)。但轉(zhuǎn)換后的too．．．to結(jié)構(gòu)中的形容詞（副詞）要用其相應(yīng)的反義詞。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…結(jié)構(gòu) 

經(jīng)典考題：

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