1. So (conj)
So是「連結詞」，和常見的and, but一樣，必須連接兩個句子。
Example:
My knee started hurting so I stopped running.
因為我的膝蓋開始痛，所以我停止跑步。
I was lost so I bought a map.
我走失了因此我買了一個地圖。
[溫馨小提醒]
需要注意的是，雖然中文會說因為… 所以…，但是千萬要小心在英文中because 跟 so是不能同時出現的，因為兩者都是連接詞，兩個句子中間之能存在一個連接詞喔。
Example:
Because I got up late, so I missed the bus. (X)
I got up late, so I missed the bus. (O)
因為我起床晚了所以我錯過了公車。
2. Therefore (adv.)
Therefore是副詞，和so不一樣，不能連接兩個字句，因此therefore倘若出現在句子中，一定還需要一個連接詞來組合這個句子。
Example:
They were unable to get funding and (連接詞) therefore (副詞) had to abandon the project.
They couldn’t get enough funding. Therefore, They abandoned the project.
他們無法得到足夠的資金，因此不得不放棄了計劃。
3. Hence (adv.)
It is very late; hence you must go to bed.
時間已經很晚了,因此你必須睡覺去。
4. Thus (adv.)
They planned to reduce staff and thus to cut costs.
他們計劃裁員，從而達到降低成本的目的
5. Accordingly (adv.)
He was too sick to stay. Accordingly, we sent him home.
他身體欠安，不能待下去了，於是我們便派人把他送回家去。
6. Consequently (adv.)
She is always bad-tempered, and consequently doesn’t have many friends.
她總是壞脾氣，因此沒有很多朋友。
7. As a consequence (片語)
The oil price keeps rising. As a consequence, I have to spend more money on it this month.
石油價格不斷上漲。因此我必須花更多錢在這上面。
8. As a result (片語)
He was ill, as a result, he could not come.
他病了, 所以他不能來了。
[小補充] 標點符號怎麼用?
你發現了嗎? 上面很多的「所以…因此…」都是副詞，而他們在句子中可以有以下幾種用法:
The rain was too heavy yesterday. therefore, the game was cancelled.
The rain was too heavy yesterday; therefore, the game was cancelled.
The rain was too heavy yesterday and therefore the game was cancelled.
