这两个单词,考试时主要考词性,THEREFORE只是个副词,而SO既可以是副词,也可以是连词.所以SO当连词时可以引导一个完整的句子,而副词就不可以.[完整的句子就是:主+谓语,主语+谓语+宾语...] [1]therefore : adverb[副词] for that reason: We were unable to get funding and therefore had to abandon the project. therefore这里引导的句子没有主语,不是一个完整的句子. [2]so conjunction[连词] and for that reason; therefore: My knee started hurting so I stopped running. I was lost so I bought a street map. so这里引导的句子有主语+谓语+[宾语] so adverb:[副词]因此,所以 He is sturdy and so fit for the job. 他很健壮,所以适合担任这个工作。[百度词典] .[so引导的句子没有主语,不是个完整的句子] 所以,当副词时一般可以互换,而当连词时,只能用so,也就是说,当引导完整句子的时候,用so. 因so两种词性兼有,表示"因此,所以"时,用起来比较频繁,不会出错.
