主課程：副詞子句（原因、結果、目的）

上一篇提到副詞子句通常都可以回答一個問題，本週介紹的原因（reason）、結果（result）、目的（purpose）之副詞子句告訴我們的是事情為何以及如何發生。

原因副詞子句（Reason Clauses）

As、since與because是在原因副詞子句中常用之附屬連接詞，其中as與since較because更為正式且通常強調的是原因造成的結果而非原因本身，because則較為強調事情發生的原因。

  1. Since the painter’s pantings are not easy to find, they are rather expensive.
  2. She practices violin every day beacause it is her dream to become a world-renowned violinist.
  3. All team members are going to work overtime tonight since the new product will be released tomorrow morning.

除了用附屬連接詞as、since與because引領的副詞子句之外，其他常見用來表示原因之用法還有如複合句FANBOYS對等連接詞當中的for，以及一些其後只可接續名詞或動名詞的片語或是介系詞（如due to、because of、as a result of等）。

結果副詞子句（Result Clauses）

  1. so + adj./adv. + that: The town was so beautiful that we even forgot to take pictures.
  2. such a(n) + n. + that: Her business is such a success that she decide to expand it internationally.
  3. so much/many + noun + that: There were so many famous restaurants in the area that we could not set our mind on what to eat.
  4. so little/few + noun + that: She had so little free time that she decided to quit the job.

其他可以用來表示結果的用法還有FANBOYS當中的so以及as a result/consequence、therefore、thus、hence、to cause、to result in等。

目的副詞子句（Purpose Clauses）

  1. so that: The new boss decided to extend working hours so that he could make more money.
  2. in order that: In order that animals could have a better living environment, the zoo decided to invest more in infrastructure.

幾個重點：

  1. In order that較為正式
  2. 目的副詞子句中常使用may/might、can/could、will/would以及have to來搭配組合
  3. 當獨立子句與目的副詞子句之主詞指的是同一事物時，常用in order to + v.或更簡單的to + v.來簡化句子，如下列兩句等同於上述第一句：
    • The new boss decided to extend working hours inorder to make more money.
    • The new boss decided to extend working hours to make more money.