so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,（肯定句和否定句有区别吗）

so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,（肯定句和否定句有区别吗）
so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,
（肯定句和否定句有区别吗）

so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,（肯定句和否定句有区别吗）
可以看看这三个例句 他太小而不能开车.
he is too young to drive a car.
he is so young that he can not drive a car.
he is not old enough to drive a car.
就是这样的模式,由too to 句变为so that 或 enough to do 句,要形式变为否定（其实句意都一样）

1、so... that【这个短语一般分开写，表明中间需要加词】。 如此…以致于；太……以至于
This is so interesting a book that I am interested by it.
这本书如此有趣以致于我的兴趣都被激发了。
The boy is so young that he can't go to school.
=The boy ...

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1、so... that【这个短语一般分开写，表明中间需要加词】。 如此…以致于；太……以至于
This is so interesting a book that I am interested by it.
这本书如此有趣以致于我的兴趣都被激发了。
The boy is so young that he can't go to school.
=The boy is too young to go to school.
转换条件：【只有当so...that 结构中用否定形式时，才能够替换为too...to结构】。
这个男孩太小了还不能上学。
2、too ...to 太...而不能...；很，非常，极其，相当。
I am too tired to go any further.我太累了再也走不动了。
=I am so tired that I can't go any further.
【特别注意】：当 too...to 结构中，如果所用的形容词表示积极、正面意义时，该结构不表示否定意义，而表示【很，非常，极其，相当】，这时，它【与so...that结构不能替换】。
I am 【too =so;very】pleased to help you.我非常高兴帮助你。
3、enough to do:足以...
Blair was kind enough to do some research.
=Blair was so kind that he did some research.【这两种结构替换，必须是“肯定句”】。
Tim is 【not old enough to】 go dancing.
=Tim is【 too young to 】go dancing.
=Tim is 【so young that 】he 【can't 】go dancing.这些替换条件都包含在句子中。
祝你学习进步，时时开心！O(∩_∩)O~~

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不能说可以替换，但的确意思关联，试举一例，
he is old enough to go to school。他年纪够大可以上学。可改写（不是替换）为he is so old that he can go to school。两句结构完全不同，所以非替换，用too to 更不能替换了。he is too old to go to school，意思就变成他年纪太大不能入学。所以too t...

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不能说可以替换，但的确意思关联，试举一例，
he is old enough to go to school。他年纪够大可以上学。可改写（不是替换）为he is so old that he can go to school。两句结构完全不同，所以非替换，用too to 更不能替换了。he is too old to go to school，意思就变成他年纪太大不能入学。所以too to 与另外两个意义是反的，肯定否定就得颠倒。
因此，若改old为young，这he is too young to go to school=he is not old enough to go to school=he is so young that he can not go to school。不知这样说明白了么

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