so that的用法：
1、so that以便；表示目的
so that = so
句子+so that+ 主語+情態(tài)動詞+V原+…
They got up early so that they could catch the early bus.
=They got up early so they could catch the early bus.
他們早早起床，以便能夠搭上早班車。
2、so that 因此、導致（結果）；表示結果
so that = so
句子, so that + 句子
The floor is wet, so (that) it is easy to fall down.
地板是濕的，容易摔跤。
so that前常有逗號
3、so…that…如此…以致于…；表示結果
1）句子+so + adj./adv. + that+句子
He was so short that he couldn’t touch it.
他是如此矮，以致他摸不到它。
2）so + adj. + a/an + n.+ that+句子
She is so nice a girl that everyone likes her.
她是如此友好的一個女孩子，以致大家都喜歡她。
3）so + many/much + n. + that+句子
He has lied so many times that I cannot trust him anymore.
他撒謊太多次了，以致我無法再相信他。
There is so much fog that I can’t see anything.
霧太濃了，（以致）我什么都看不到。