例：I heard some noise outside, so I went out of the room to see why.
so that作为连词词组，表示 “以便，为了”。
例：The vase is put high on the table, so that it won’t be broken.
例：The newspapers claim she killed him in self defence but that just isn’t so.
例：She was so tired that she fell asleep very fast.
例：It is so good a movie that everyone who saw it praises it very much.
例：“Will I need my umbrella?”
“I think so.”
例：Tony takes exercise every day and so does his younger brother.
例：Jenny has never been late for class.Neither/Nor her younger brother.
例：Tony works very hard at all the subjects.So he does.
例：So you think you've got troubles?
常见结构：and so on/and so forth：等等;so as to(do)：以便;so that+从句：以便
例：We eat different vegetables， such as tomato，potato，celery，and so on.
They got up early so as to catch the first bus.
They got up so early that they could catch the first bus.