基礎英文文法 Lesson 20《副詞連接詞》

所謂『副詞連接詞』(Con­junc­tive Adverbs) 就是用來引導副詞子句,以表示與主要子句間在時間、條件、因果、讓步等的關係。常見的副詞連接詞如下:
表示【時間】的副詞連接詞:
before, after, when, while, since, until, as soon as…

表示【條件】的副詞連接詞:
if, unless, once…

表示【原因】的副詞連接詞:
because, since…

表示【讓步】的副詞連接詞:
though, although, even though…

使用要點:
1.    副詞連接詞無法像對等連接詞一樣連接對等的單字或片語,只能連接子句。
Exam­ple: Kel­ly had her lunch before she went shop­ping. (Kel­ly在購物前吃了午餐)
Dan didn’t go to school because he caught a cold. (Dan今天沒去上學,因為他感冒了)
這裡的before和because就是連接兩個句子

  1. 副詞連接詞帶出來的句子就是副詞子句,做副詞用,必須與主要子句搭配使用,用來修飾主要子句,不能單獨存在。
    Exam­ple: You won’t pass the exam if you don’t work hard. (你不認真讀書就不會通過考試)
    這裡的主要子句Y­ou won’t pass the exam可以單獨存在
    但是副詞子句if you don’t work hard就不可以單獨存在了

    3.    
    副詞子句若置於句首,需用逗點與主要子句區隔。
    上述的例題可改為Be­fore Kel­ly went shop­ping, she had her lunch.
    Because Dan caught a cold, he didn’t go to school today.
    If you don’t work hard, you won’t pass the exam.
  2. 避免重複使用。
    雖然中文都有【因為…所以…】和【雖然…但是…】的句型,但是在英文的使用上,有Because就不能有so,有Although就不能有but!
    Exam­ple: Because nobody was at home, she cried.
    =She cried because nobody was at home.
    =Nobody was at home, so she cried. (因為沒人在家,所以她哭了)
    Although it was cold, they went swimming.
    =They went swim­ming, although it was cold.
    = It was cold, but they went swim­ming. (雖然很冷,他們還是去游泳)

    5.    
    表示『條件』的副詞子句必須用現在式代替未來式。
    由if, unless, once帶出的表示條件的子句要用現在式,主要子句用未來式。
    Exam­ple: If it rains, we will not go to the zoo. (如果下雨我們就不去動物園)
    副詞子句 主要子句

He will be fine once he gets enough sleep. (他一旦有了充足的睡眠就沒事了)
主要子句 副詞子句

6.    
句中如果出現afterbeforeuntil等連接詞,先發生的動作可以用簡單過去式代替過去完成式。
Exam­ple: After I had fin­ished my home­work, I watched TV.
= After I fin­ished my home­work, I watched TV. (我做完作業就去看電視)
也就是說主要子句和副詞子句都用過去式就對了!

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