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    1. 英語學科網
      高中
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      初中英語:最重要的三類狀語從句!

      狀語從句指在句子中用作狀語的從句。根據其作用可分為時間、地點、原因、條件、目的、結果、讓步、方式和比較等九種狀語從句。

      初中階段,我們學習的狀語從句主要有時間狀語從句、條件狀語從句和原因狀語從句,今天我們就來學習以下這三種狀語從句。

      一. 時間狀語從句

      主要連詞:when、while、as、as soon as(一......就......)、before、after、since等。

      【注意1】時間狀語從句要符合“主將從現”的原則:即主句用一般將來時,從句用一般現在時。

      例如:

      I will call you as soon as I arrive in Beijing.

      我一到北京就給你打電話。

      I will give you a call when I arrive at London.

      【注意2】since 的用法: since引導的時間狀語從句必須是一般過去時,其主句必須時現在完成時。

      例如:

      Since I came to Beijing, I have lived here.

      【注意3】while 引導的時間狀語從句中,謂語動詞必須時持續的; when 引導的時間狀語從句中,謂語動詞可以持續也可以不持續。

      例如:

      While I was away last summer, my dog was taken good care of.

      When I lived in that small village,I often went to play in the field.

      When the film ended,all the people began to go out of the cinema.

      二. 條件狀語從句

      主要連詞:if, unless(除非=if...not...), as long as(只要)等。

      例如:

      If it is fine tomorrow,we will have a picnic outdoors.

      如果明天天氣好,我們會在戶外野餐。

      Unless you work hard, you won't succeed.(=If you don't work hard, you won't succeed.)

      As long as you go, I will go.

      三. 原因狀語從句

      主要連詞:because, as(由于), since(因為,既然)等。

      【注意】because 引導的原因是未知的原因,as和since引導的原因是已知的原因。

      例如:

      I didn't go to school because I was ill.

      As it is raining heavily, we won't go to the park.

      Since everyone is here, let's begin our meeting.
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