1.(expressing result)因此；所以
It rained, so I got wet.下雨了, 结果我被淋湿了。
The shop was closed, so I went home.商店关门了, 所以我就回家了。
2.(indicating purpose)为了；以便
Sit here so we can talk.坐这儿, 我们就能谈谈了。
3.just as … so …<正式>(indicating similarities)正如…那样, …也是如此
Just as John has changed, so has his wife.正如约翰已经变了那样, 他太太也变了。