Question

so that too to old enough to区别

Answer 1

enough to可以转换为too…to结构。
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 work. ＝He is too young to do the work.
so…that与too…to的转换
当that引导的从句为否定式且从句主语与主句的主语相同时，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：
She is so young that she can’t go to school. ＝She is too young to go to school.
The box is so heavy that he can’t carry it. ＝The box is too heavy for him to carry

追答

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：
Xiao Lin is so old that he can go to school. ＝Xiao Lin is old enough to go to school.
The box is so light that he can carry it. ＝The box is light enough for him to carry.