sothat的意思是inorderto，"为了，以便"sothat引导的是一个目的的状语从句中通常带有can,could,may,might,should等情态动词,以适用于目的.
Hetrieshisbestsothathecandefeathisrivals.
so that用法：
1. 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）
so……that的用法和辨析
2.同义替换：
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
3.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。)
so……that的用法和辨析
4.注意：
如果名词前有much，many,few, little等词语修饰时，要用so而不是such.
eg:She has changed so much that i can hardly recognize her.
( 她变化太大了，以至于我几乎认不出来她。）
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