在中文中，我們常常會說「因為……，所以……」，以文法的觀點來看，就是在同一個句子裡面用了兩個連接詞，來表達前後句子的因果關係。然而，在英文中，有些「連接詞」不能出現在同一個句子裡，現在就讓我們看看有哪些例子吧！
 

because表達「因為……」的意思，其後接的子句用來表達「原因」；so表達「所以……」的意思，其後接的子句用來表達「結果」，例如：
☑ Because she was sick, she didn’t go to school.
因為她病了，所以她沒去上學。
 
☑ She was sick, so she didn’t go to school.
因為她病了，所以她沒去上學。
 
但不能將其表達為：
☒ Because she was sick, so she didn’t go to school.
 
再舉一個例子：
☑ It is a bit cloudy, so I take my umbrella with me.
  因為有點陰天，所以我帶了傘。
 
☑ I take my umbrella with me because it is a bit cloudy.
  因為有點陰天，所以我帶了傘。
 
但不能將其表達為：
☒ Because it is a bit cloudy, so I take my umbrella with me.
 

although和though表達「雖然……」的意思，其後接的子句用來表達「目前的情況」；but表達「但是……」的意思，其後接的子句用來表達「轉折的結果」，例如：
☑ Although my father is eighty, he is still very much alive.
  雖然我父親已經八十歲了，但他仍然很有活力。
 
☑ My father is eighty, but he is still very much alive.
  雖然我父親已經八十歲了，但他仍然很有活力。
 
但不能將其表達為：
☒ Although my father is eighty, but he is still very much alive.
 
再舉一個例子：
☑ Though Jack was poor, he never gave up his dream.
  雖然傑克很窮，但他從未放棄過自己的夢想。
 
☑ Jack was poor, but he never gave up his dream.
  雖然傑克很窮，但他從未放棄過自己的夢想。
 
但不能將其表達為：
☒ Though Jack was poor, but he never gave up his dream.
 
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