这几个词的区别大致可从以下几方面去看：
1、therefore adv.因此, 所以=for that reason=consequently常用于连接两个并列分句,其前加“and”或分号“；”.
He was ill, and therefore could not come. 他病了, 所以未能来.
He has broken his leg and therefore he can't walk.他摔坏了腿,因此不能走路了.
We do not have enough money. Therefore we cannot afford to buy the new car.我们的钱不够,因此买不成这辆新车.
2、so conj. adv因而, 所以, 结果是
It was late, so we went home. 天晚了, 所以我们就回家去了.
He was sick, so they were quiet.他病了,所以他们很安静.
3、hence adv.因此, 从此
The town was built among the hills, hence the name Hilltown. 该城镇修建在群山之中,故取名'山城'.
It is very late; hence you must go to bed.时间已经很晚了,因此你必须睡觉去.（记住前面是分号,而不是逗号）
4、then adv因此,就
Go into the cave, then they won't see you. 躲进洞里去,那他们就看不到你了.
5、accordingly adv.因此, 从而；所以,因此结果；因此（偶作连词使用conj.）
He was asked to leave the city and accordingly he went.有人叫他离开该城市,所以他就走了.
You may arrange accordingly.你可以权宜处理.
Mr Foster has never been to China. Consequently / Hence he knows very little about it.福斯特先生从未去过中国,所以对中国了解得很少.
My car was broken down and consequently I was late. = in consequence
6、Thus adv.如此,像这样；因此；于是
He sold his farm and thus he had enough money for his journey.他卖掉了农场,这样他就有足够的钱旅行了.
There has been no rain — thus, the crops are drying.天没下雨,因此庄稼要枯死了.
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