not ...enough to do sth. 做某事不够....,too...to...太.... 而不能做... so ... that...是复合句，也可以表达的
so...that...+否定句
例如：He is too young to go to school.
= He is so young that he can't go to school.
“so that+否定句”句型，“太·······，以至于（不能）······”
eg : She is too weak to curry these books.
She is so weak that she can't carry these books.
too+形容词+to do sth
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