so……that可以和too……to……或者enough to do sth替换。
eg：The car is so expensive that I can't afford it.
=The car is too expensive for me to buy.
（这辆车太贵了，我负担不起。）
eg: He is so old that he can take care of himself.
=He is old enough to take care of himself.
（他年龄足够大了，可以照顾自己了。）
需要注意的是：that后面加句子，to后面加动词原形。
so……that的用法和辨析
一、so....that，such……that，so that的辨析
1、so....that，意为“如此……以至于……＂，so用来修饰形容词或副词。
2、such……that，意为“如此……以至于……”，such用来修饰名词。
3、so that，意为“为的是，以便于”，用来引导目的状语从句。
eg：She was so angry that she couldn't speak.
（她太生气了，以至于说不出来话了。）
It was such a boring speech that i feel asleep.
（那是一个如此无聊的演讲，以至于我都睡着了。）
I read more books so that i can catch up with my classmates.
（我读更多的书，以便能赶上我的同学。）
二、so....that的用法
意为“如此……以至于……”，so用来修饰形容词或副词。
eg: The bag is so heavy that I can't carry it.
（这个袋子太重了，我提不动）