1．so that引导目的状语从句． 意思是：以致，为了，以便于
这个词组还可以和in order that ,in order to ,so as to 进行替换．
如：I got up very early this morning so that I could catch the early train
=I got up very early this morning in order that I could catch the early train.= I got up very early this morning in order to catch the early train.
＝I got up very early this morning so as to catch the early train..
我今天早晨起来得很早以便能够赶上早班火车．
I finished my homework quickly so that I could go to bed earlier.
我很快地完成了作业以便我能够早点睡觉．
2．so....that 引导结果状语从句．意思是：如此．．．以致, 这个词组可以和too..to 进行替换。
This problem is so difficult that I can''t work it out.
这道题如此地难以致我做不出来．
=This problem is too difficult for me to work out.
He is so young that he can''t go to school.
=He is too young to go to school.
他年纪这么小不能上学．
He is so short that he can''t go to school.
他个子这么矮以致于他够不着这些苹果．
=He is too short to reach the apples.
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