thus/so/therefore与“因此、如此”
这三个词均可用作连词、副词，具体用法如下：
⑴用作副词时，这三个词都可与and连用，用于连接并列分句，此时可以互换使用。如：
He forgot to turn on the radio and thus missed the program.他忘了打开收音机, 因此错过了那个节目。
It was snowing, and so I could not go out. 天在下雪，所以我无法外出。
He was very tired, and therefore he didn't give the market report. 他非常疲倦，所以没能作市场报告。
注意：so用作副词时，常修饰形容词或其他副词；therefore可位于句中，前后用逗号隔开。如：
People are not so honest as they once were.人们现在不如过去那样诚实了。
The novelist, therefore, has a special responsibility both the present and the past of his country. 因此，小说家对国家的现在和过去都负有特殊的责任。
⑵用作连词时，so可独立引导并列分句（分句前可用逗号或不用）；therefore/thus其前必须有分号（或破折号）隔开或与and连用，才能引导并列分句。试比较：
He was sick, so they were quiet.他病了，所以他们很安静。
There has been no rain — thus, the crops are drying.天没下雨，因此庄稼要枯死了。
It rained; therefore the game was called off.下雨了，因此比赛取消了。
常见短语：and so on/and so forth等等；so as to（= in order to）以便；so that（= in order that）以便、所以；thus far至今、迄今（= so far/ up to now/ til now/until now）。如：
This shop sells clothes, shoes, hats and so on.这商店卖衣服, 鞋, 帽子等等。
He ran quickly so as to catch the last bus.他跑得很快以便赶上那末班车。
I stopped so that you could catch up.我停下来以便你能赶上。
We haven't had any problems thus far.迄今为止，我们还没有什么问题。
原文地址：http://blog.sina.com.cn/s/blog_575e112f0100zu8c.html
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