初中英語:最重要的三類狀語從句!
來源:網絡整理網絡整理
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.
來源:網絡