enough to,too to,so that的区别

enough to，too to，so that的区别
too... to...意为“太……以致不能……”, too后接形容词或副词, to 是动词不定式符号, 后接动词原形, 动词不定式表示否定意义。

一、too... to ...的意义
too...to...表示"太……而不能……"。

例如：
1,He is too young to join the army.他年龄太小，不能参军。

2,The math problem is too difficult for me to work out.这道数学题太难我不能解出它。

四、too...to...结构与... enough to...结构及so...that...结构的相互转换
1. too...to...结构转换为...enough to...结构时要注意：
①enough前的形容词或副词须是too前面形容词或副词的反义词；
②...enough to ...句式须用否定式；③too...to...结构有逻辑主语时，...enough to...结构也要加上逻辑主语。

例如：
She is too young to do the work. →She isn't old enough to do the work.
2.将too...to...结构转换为so...that...结构时要注意：①so...that...结构是复合句，so的后面接形容词或副词，that的后面接从句；②that 后面的从句要用否定形式。

例如：
She is too young to do the work. →She is so young that she can't do the work.。